From 931a680337506c115ee276c3830d322fdafac029 Mon Sep 17 00:00:00 2001
From: Tejas Bubane <tejasbubane@gmail.com>
Date: Sun, 17 May 2020 22:30:46 +0530
Subject: rake 'update[v4.5.0]'

---
 assets/stylesheets/_bootstrap-grid.scss            |  6 ++--
 assets/stylesheets/_bootstrap-reboot.scss          |  6 ++--
 assets/stylesheets/_bootstrap.scss                 |  6 ++--
 assets/stylesheets/bootstrap/_breadcrumb.scss      |  2 ++
 assets/stylesheets/bootstrap/_buttons.scss         | 17 +++++----
 assets/stylesheets/bootstrap/_card.scss            | 18 ++++++----
 assets/stylesheets/bootstrap/_close.scss           |  1 -
 assets/stylesheets/bootstrap/_custom-forms.scss    |  3 +-
 assets/stylesheets/bootstrap/_dropdown.scss        |  3 +-
 assets/stylesheets/bootstrap/_forms.scss           |  9 +++++
 assets/stylesheets/bootstrap/_functions.scss       | 17 ++++++---
 assets/stylesheets/bootstrap/_grid.scss            | 10 +++++-
 assets/stylesheets/bootstrap/_input-group.scss     |  3 +-
 assets/stylesheets/bootstrap/_list-group.scss      | 22 +++++-------
 assets/stylesheets/bootstrap/_modal.scss           |  2 ++
 assets/stylesheets/bootstrap/_nav.scss             |  1 +
 assets/stylesheets/bootstrap/_pagination.scss      |  1 +
 assets/stylesheets/bootstrap/_progress.scss        |  1 +
 assets/stylesheets/bootstrap/_reboot.scss          | 22 ++++++------
 assets/stylesheets/bootstrap/_spinners.scss        |  1 +
 assets/stylesheets/bootstrap/_utilities.scss       |  3 +-
 assets/stylesheets/bootstrap/_variables.scss       |  4 +++
 .../bootstrap/mixins/_background-variant.scss      |  3 +-
 .../bootstrap/mixins/_border-radius.scss           | 39 ++++++++++++++-------
 assets/stylesheets/bootstrap/mixins/_buttons.scss  | 12 +++----
 assets/stylesheets/bootstrap/mixins/_forms.scss    |  4 +--
 .../bootstrap/mixins/_grid-framework.scss          | 40 ++++++++++++++--------
 .../stylesheets/bootstrap/mixins/_transition.scss  | 24 +++++++++----
 .../bootstrap/utilities/_background.scss           |  2 +-
 .../bootstrap/utilities/_interactions.scss         |  5 +++
 assets/stylesheets/bootstrap/utilities/_text.scss  |  3 +-
 31 files changed, 184 insertions(+), 106 deletions(-)
 create mode 100644 assets/stylesheets/bootstrap/utilities/_interactions.scss

(limited to 'assets/stylesheets')

diff --git a/assets/stylesheets/_bootstrap-grid.scss b/assets/stylesheets/_bootstrap-grid.scss
index c9d91bb..30f5f23 100644
--- a/assets/stylesheets/_bootstrap-grid.scss
+++ b/assets/stylesheets/_bootstrap-grid.scss
@@ -1,7 +1,7 @@
 /*!
- * Bootstrap Grid v4.4.1 (https://getbootstrap.com/)
- * Copyright 2011-2019 The Bootstrap Authors
- * Copyright 2011-2019 Twitter, Inc.
+ * Bootstrap Grid v4.5.0 (https://getbootstrap.com/)
+ * Copyright 2011-2020 The Bootstrap Authors
+ * Copyright 2011-2020 Twitter, Inc.
  * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
  */
 
diff --git a/assets/stylesheets/_bootstrap-reboot.scss b/assets/stylesheets/_bootstrap-reboot.scss
index 6b1b52c..4a192bd 100644
--- a/assets/stylesheets/_bootstrap-reboot.scss
+++ b/assets/stylesheets/_bootstrap-reboot.scss
@@ -1,7 +1,7 @@
 /*!
- * Bootstrap Reboot v4.4.1 (https://getbootstrap.com/)
- * Copyright 2011-2019 The Bootstrap Authors
- * Copyright 2011-2019 Twitter, Inc.
+ * Bootstrap Reboot v4.5.0 (https://getbootstrap.com/)
+ * Copyright 2011-2020 The Bootstrap Authors
+ * Copyright 2011-2020 Twitter, Inc.
  * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
  * Forked from Normalize.css, licensed MIT (https://github.com/necolas/normalize.css/blob/master/LICENSE.md)
  */
diff --git a/assets/stylesheets/_bootstrap.scss b/assets/stylesheets/_bootstrap.scss
index ca440a1..baca8c3 100644
--- a/assets/stylesheets/_bootstrap.scss
+++ b/assets/stylesheets/_bootstrap.scss
@@ -1,7 +1,7 @@
 /*!
- * Bootstrap v4.4.1 (https://getbootstrap.com/)
- * Copyright 2011-2019 The Bootstrap Authors
- * Copyright 2011-2019 Twitter, Inc.
+ * Bootstrap v4.5.0 (https://getbootstrap.com/)
+ * Copyright 2011-2020 The Bootstrap Authors
+ * Copyright 2011-2020 Twitter, Inc.
  * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
  */
 
diff --git a/assets/stylesheets/bootstrap/_breadcrumb.scss b/assets/stylesheets/bootstrap/_breadcrumb.scss
index d748894..a0cf7e2 100644
--- a/assets/stylesheets/bootstrap/_breadcrumb.scss
+++ b/assets/stylesheets/bootstrap/_breadcrumb.scss
@@ -10,6 +10,8 @@
 }
 
 .breadcrumb-item {
+  display: flex;
+
   // The separator between breadcrumbs (by default, a forward-slash: "/")
   + .breadcrumb-item {
     padding-left: $breadcrumb-item-padding;
diff --git a/assets/stylesheets/bootstrap/_buttons.scss b/assets/stylesheets/bootstrap/_buttons.scss
index e87d339..6ee24ba 100644
--- a/assets/stylesheets/bootstrap/_buttons.scss
+++ b/assets/stylesheets/bootstrap/_buttons.scss
@@ -10,9 +10,9 @@
   font-weight: $btn-font-weight;
   color: $body-color;
   text-align: center;
+  text-decoration: if($link-decoration == none, null, none);
   white-space: $btn-white-space;
   vertical-align: middle;
-  cursor: if($enable-pointer-cursor-for-buttons, pointer, null);
   user-select: none;
   background-color: transparent;
   border: $btn-border-width solid transparent;
@@ -37,12 +37,16 @@
     @include box-shadow(none);
   }
 
-  &:not(:disabled):not(.disabled):active,
-  &:not(:disabled):not(.disabled).active {
-    @include box-shadow($btn-active-box-shadow);
+  &:not(:disabled):not(.disabled) {
+    cursor: if($enable-pointer-cursor-for-buttons, pointer, null);
 
-    &:focus {
-      @include box-shadow($btn-focus-box-shadow, $btn-active-box-shadow);
+    &:active,
+    &.active {
+      @include box-shadow($btn-active-box-shadow);
+
+      &:focus {
+        @include box-shadow($btn-focus-box-shadow, $btn-active-box-shadow);
+      }
     }
   }
 }
@@ -89,7 +93,6 @@ fieldset:disabled a.btn {
   &:focus,
   &.focus {
     text-decoration: $link-hover-decoration;
-    box-shadow: none;
   }
 
   &:disabled,
diff --git a/assets/stylesheets/bootstrap/_card.scss b/assets/stylesheets/bootstrap/_card.scss
index d6759fd..fabe9f3 100644
--- a/assets/stylesheets/bootstrap/_card.scss
+++ b/assets/stylesheets/bootstrap/_card.scss
@@ -19,15 +19,18 @@
     margin-left: 0;
   }
 
-  > .list-group:first-child {
-    .list-group-item:first-child {
-      @include border-top-radius($card-border-radius);
+  > .list-group {
+    border-top: inherit;
+    border-bottom: inherit;
+
+    &:first-child {
+      border-top-width: 0;
+      @include border-top-radius($card-inner-border-radius);
     }
-  }
 
-  > .list-group:last-child {
-    .list-group-item:last-child {
-      @include border-bottom-radius($card-border-radius);
+    &:last-child  {
+      border-bottom-width: 0;
+      @include border-bottom-radius($card-inner-border-radius);
     }
   }
 }
@@ -90,6 +93,7 @@
 
 .card-footer {
   padding: $card-spacer-y $card-spacer-x;
+  color: $card-cap-color;
   background-color: $card-cap-bg;
   border-top: $card-border-width solid $card-border-color;
 
diff --git a/assets/stylesheets/bootstrap/_close.scss b/assets/stylesheets/bootstrap/_close.scss
index 071aebe..82e9593 100644
--- a/assets/stylesheets/bootstrap/_close.scss
+++ b/assets/stylesheets/bootstrap/_close.scss
@@ -30,7 +30,6 @@ button.close {
   padding: 0;
   background-color: transparent;
   border: 0;
-  appearance: none;
 }
 
 // Future-proof disabling of clicks on `<a>` elements
diff --git a/assets/stylesheets/bootstrap/_custom-forms.scss b/assets/stylesheets/bootstrap/_custom-forms.scss
index 21e72da..0804c63 100644
--- a/assets/stylesheets/bootstrap/_custom-forms.scss
+++ b/assets/stylesheets/bootstrap/_custom-forms.scss
@@ -237,8 +237,9 @@
     border-color: $custom-select-focus-border-color;
     outline: 0;
     @if $enable-shadows {
-      box-shadow: $custom-select-box-shadow, $custom-select-focus-box-shadow;
+      @include box-shadow($custom-select-box-shadow, $custom-select-focus-box-shadow);
     } @else {
+      // Avoid using mixin so we can pass custom focus shadow properly
       box-shadow: $custom-select-focus-box-shadow;
     }
 
diff --git a/assets/stylesheets/bootstrap/_dropdown.scss b/assets/stylesheets/bootstrap/_dropdown.scss
index 76f33a4..2ab7536 100644
--- a/assets/stylesheets/bootstrap/_dropdown.scss
+++ b/assets/stylesheets/bootstrap/_dropdown.scss
@@ -128,6 +128,7 @@
   font-weight: $font-weight-normal;
   color: $dropdown-link-color;
   text-align: inherit; // For `<button>`s
+  text-decoration: if($link-decoration == none, null, none);
   white-space: nowrap; // prevent links from randomly breaking onto new lines
   background-color: transparent; // For `<button>`s
   border: 0; // For `<button>`s
@@ -176,7 +177,7 @@
 // Dropdown section headers
 .dropdown-header {
   display: block;
-  padding: $dropdown-padding-y $dropdown-item-padding-x;
+  padding: $dropdown-header-padding;
   margin-bottom: 0; // for use with heading elements
   @include font-size($font-size-sm);
   color: $dropdown-header-color;
diff --git a/assets/stylesheets/bootstrap/_forms.scss b/assets/stylesheets/bootstrap/_forms.scss
index b2edb7b..66a4efe 100644
--- a/assets/stylesheets/bootstrap/_forms.scss
+++ b/assets/stylesheets/bootstrap/_forms.scss
@@ -59,6 +59,15 @@
   }
 }
 
+input[type="date"],
+input[type="time"],
+input[type="datetime-local"],
+input[type="month"] {
+  &.form-control {
+    appearance: none; // Fix appearance for date inputs in Safari
+  }
+}
+
 select.form-control {
   &:focus::-ms-value {
     // Suppress the nested default white text on blue background highlight given to
diff --git a/assets/stylesheets/bootstrap/_functions.scss b/assets/stylesheets/bootstrap/_functions.scss
index 695e6cd..eb2471d 100644
--- a/assets/stylesheets/bootstrap/_functions.scss
+++ b/assets/stylesheets/bootstrap/_functions.scss
@@ -23,10 +23,12 @@
 // Starts at zero
 // Used to ensure the min-width of the lowest breakpoint starts at 0.
 @mixin _assert-starts-at-zero($map, $map-name: "$grid-breakpoints") {
-  $values: map-values($map);
-  $first-value: nth($values, 1);
-  @if $first-value != 0 {
-    @warn "First breakpoint in #{$map-name} must start at 0, but starts at #{$first-value}.";
+  @if length($map) > 0 {
+    $values: map-values($map);
+    $first-value: nth($values, 1);
+    @if $first-value != 0 {
+      @warn "First breakpoint in #{$map-name} must start at 0, but starts at #{$first-value}.";
+    }
   }
 }
 
@@ -52,7 +54,12 @@
 @function escape-svg($string) {
   @if str-index($string, "data:image/svg+xml") {
     @each $char, $encoded in $escaped-characters {
-      $string: str-replace($string, $char, $encoded);
+      // Do not escape the url brackets
+      @if str-index($string, "url(") == 1 {
+        $string: url("#{str-replace(str-slice($string, 6, -3), $char, $encoded)}");
+      } @else {
+        $string: str-replace($string, $char, $encoded);
+      }
     }
   }
 
diff --git a/assets/stylesheets/bootstrap/_grid.scss b/assets/stylesheets/bootstrap/_grid.scss
index d36ee75..57ec5a9 100644
--- a/assets/stylesheets/bootstrap/_grid.scss
+++ b/assets/stylesheets/bootstrap/_grid.scss
@@ -25,11 +25,19 @@
         max-width: $container-max-width;
       }
 
+      // Extend each breakpoint which is smaller or equal to the current breakpoint
+      $extend-breakpoint: true;
+
       @each $name, $width in $grid-breakpoints {
-        @if ($container-max-width > $width or $breakpoint == $name) {
+        @if ($extend-breakpoint) {
           .container#{breakpoint-infix($name, $grid-breakpoints)} {
             @extend %responsive-container-#{$breakpoint};
           }
+
+          // Once the current breakpoint is reached, stop extending
+          @if ($breakpoint == $name) {
+            $extend-breakpoint: false;
+          }
         }
       }
     }
diff --git a/assets/stylesheets/bootstrap/_input-group.scss b/assets/stylesheets/bootstrap/_input-group.scss
index bf69ddb..cad8ea3 100644
--- a/assets/stylesheets/bootstrap/_input-group.scss
+++ b/assets/stylesheets/bootstrap/_input-group.scss
@@ -16,7 +16,8 @@
   > .custom-select,
   > .custom-file {
     position: relative; // For focus state's z-index
-    flex: 1 1 0%;
+    flex: 1 1 auto;
+    width: 1%;
     min-width: 0; // https://stackoverflow.com/questions/36247140/why-dont-flex-items-shrink-past-content-size
     margin-bottom: 0;
 
diff --git a/assets/stylesheets/bootstrap/_list-group.scss b/assets/stylesheets/bootstrap/_list-group.scss
index 468c2e3..37c307e 100644
--- a/assets/stylesheets/bootstrap/_list-group.scss
+++ b/assets/stylesheets/bootstrap/_list-group.scss
@@ -9,6 +9,7 @@
   // No need to set list-style: none; since .list-group-item is block level
   padding-left: 0; // reset padding because ul and ol
   margin-bottom: 0;
+  @include border-radius($list-group-border-radius);
 }
 
 
@@ -46,15 +47,16 @@
   display: block;
   padding: $list-group-item-padding-y $list-group-item-padding-x;
   color: $list-group-color;
+  text-decoration: if($link-decoration == none, null, none);
   background-color: $list-group-bg;
   border: $list-group-border-width solid $list-group-border-color;
 
   &:first-child {
-    @include border-top-radius($list-group-border-radius);
+    @include border-top-radius(inherit);
   }
 
   &:last-child {
-    @include border-bottom-radius($list-group-border-radius);
+    @include border-bottom-radius(inherit);
   }
 
   &.disabled,
@@ -94,7 +96,7 @@
     .list-group-horizontal#{$infix} {
       flex-direction: row;
 
-      .list-group-item {
+      > .list-group-item {
         &:first-child {
           @include border-bottom-left-radius($list-group-border-radius);
           @include border-top-right-radius(0);
@@ -130,18 +132,12 @@
 // useful within other components (e.g., cards).
 
 .list-group-flush {
-  .list-group-item {
-    border-right-width: 0;
-    border-left-width: 0;
-    @include border-radius(0);
+  @include border-radius(0);
 
-    &:first-child {
-      border-top-width: 0;
-    }
-  }
+  > .list-group-item {
+    border-width: 0 0 $list-group-border-width;
 
-  &:last-child {
-    .list-group-item:last-child {
+    &:last-child {
       border-bottom-width: 0;
     }
   }
diff --git a/assets/stylesheets/bootstrap/_modal.scss b/assets/stylesheets/bootstrap/_modal.scss
index 9053c17..a6d0f06 100644
--- a/assets/stylesheets/bootstrap/_modal.scss
+++ b/assets/stylesheets/bootstrap/_modal.scss
@@ -83,6 +83,7 @@
   &::before {
     display: block; // IE10
     height: subtract(100vh, $modal-dialog-margin * 2);
+    height: min-content; // Reset height to 0 except on IE
     content: "";
   }
 
@@ -217,6 +218,7 @@
 
     &::before {
       height: subtract(100vh, $modal-dialog-margin-y-sm-up * 2);
+      height: min-content;
     }
   }
 
diff --git a/assets/stylesheets/bootstrap/_nav.scss b/assets/stylesheets/bootstrap/_nav.scss
index 667d682..b8b73bb 100644
--- a/assets/stylesheets/bootstrap/_nav.scss
+++ b/assets/stylesheets/bootstrap/_nav.scss
@@ -14,6 +14,7 @@
 .nav-link {
   display: block;
   padding: $nav-link-padding-y $nav-link-padding-x;
+  text-decoration: if($link-decoration == none, null, none);
 
   @include hover-focus() {
     text-decoration: none;
diff --git a/assets/stylesheets/bootstrap/_pagination.scss b/assets/stylesheets/bootstrap/_pagination.scss
index 953a35a..d7d553c 100644
--- a/assets/stylesheets/bootstrap/_pagination.scss
+++ b/assets/stylesheets/bootstrap/_pagination.scss
@@ -11,6 +11,7 @@
   margin-left: -$pagination-border-width;
   line-height: $pagination-line-height;
   color: $pagination-color;
+  text-decoration: if($link-decoration == none, null, none);
   background-color: $pagination-bg;
   border: $pagination-border-width solid $pagination-border-color;
 
diff --git a/assets/stylesheets/bootstrap/_progress.scss b/assets/stylesheets/bootstrap/_progress.scss
index 37ef602..1a03704 100644
--- a/assets/stylesheets/bootstrap/_progress.scss
+++ b/assets/stylesheets/bootstrap/_progress.scss
@@ -10,6 +10,7 @@
   display: flex;
   height: $progress-height;
   overflow: hidden; // force rounded corners by cropping it
+  line-height: 0;
   @include font-size($progress-font-size);
   background-color: $progress-bg;
   @include border-radius($progress-border-radius);
diff --git a/assets/stylesheets/bootstrap/_reboot.scss b/assets/stylesheets/bootstrap/_reboot.scss
index b6c98cc..5a52b58 100644
--- a/assets/stylesheets/bootstrap/_reboot.scss
+++ b/assets/stylesheets/bootstrap/_reboot.scss
@@ -229,6 +229,9 @@ pre {
   margin-bottom: 1rem;
   // Don't allow content to break outside
   overflow: auto;
+  // Disable auto-hiding scrollbar in IE & legacy Edge to avoid overlap,
+  // making it impossible to interact with the content
+  -ms-overflow-style: scrollbar;
 }
 
 
@@ -330,6 +333,13 @@ select {
   text-transform: none; // Remove the inheritance of text transform in Firefox
 }
 
+// Set the cursor for non-`<button>` buttons
+//
+// Details at https://github.com/twbs/bootstrap/pull/30562
+[role="button"] {
+  cursor: pointer;
+}
+
 // Remove the inheritance of word-wrap in Safari.
 //
 // Details at https://github.com/twbs/bootstrap/issues/24990
@@ -376,18 +386,6 @@ input[type="checkbox"] {
 }
 
 
-input[type="date"],
-input[type="time"],
-input[type="datetime-local"],
-input[type="month"] {
-  // Remove the default appearance of temporal inputs to avoid a Mobile Safari
-  // bug where setting a custom line-height prevents text from being vertically
-  // centered within the input.
-  // See https://bugs.webkit.org/show_bug.cgi?id=139848
-  // and https://github.com/twbs/bootstrap/issues/11266
-  -webkit-appearance: listbox;
-}
-
 textarea {
   overflow: auto; // Remove the default vertical scrollbar in IE.
   // Textareas should really only resize vertically so they don't break their (horizontal) containers.
diff --git a/assets/stylesheets/bootstrap/_spinners.scss b/assets/stylesheets/bootstrap/_spinners.scss
index 364a5c1..27c9241 100644
--- a/assets/stylesheets/bootstrap/_spinners.scss
+++ b/assets/stylesheets/bootstrap/_spinners.scss
@@ -34,6 +34,7 @@
   }
   50% {
     opacity: 1;
+    transform: none;
   }
 }
 
diff --git a/assets/stylesheets/bootstrap/_utilities.scss b/assets/stylesheets/bootstrap/_utilities.scss
index a5de31b..10e31dd 100644
--- a/assets/stylesheets/bootstrap/_utilities.scss
+++ b/assets/stylesheets/bootstrap/_utilities.scss
@@ -6,12 +6,13 @@
 @import "utilities/embed";
 @import "utilities/flex";
 @import "utilities/float";
+@import "utilities/interactions";
 @import "utilities/overflow";
 @import "utilities/position";
 @import "utilities/screenreaders";
 @import "utilities/shadows";
 @import "utilities/sizing";
-@import "utilities/stretched-link";
 @import "utilities/spacing";
+@import "utilities/stretched-link";
 @import "utilities/text";
 @import "utilities/visibility";
diff --git a/assets/stylesheets/bootstrap/_variables.scss b/assets/stylesheets/bootstrap/_variables.scss
index 5d3135c..22fafe1 100644
--- a/assets/stylesheets/bootstrap/_variables.scss
+++ b/assets/stylesheets/bootstrap/_variables.scss
@@ -106,6 +106,8 @@ $escaped-characters: (
   ("<","%3c"),
   (">","%3e"),
   ("#","%23"),
+  ("(","%28"),
+  (")","%29"),
 ) !default;
 
 
@@ -786,6 +788,7 @@ $dropdown-item-padding-y:           .25rem !default;
 $dropdown-item-padding-x:           1.5rem !default;
 
 $dropdown-header-color:             $gray-600 !default;
+$dropdown-header-padding:           $dropdown-padding-y $dropdown-item-padding-x !default;
 
 
 // Pagination
@@ -1135,6 +1138,7 @@ $pre-scrollable-max-height:         340px !default;
 $displays: none, inline, inline-block, block, table, table-row, table-cell, flex, inline-flex !default;
 $overflows: auto, hidden !default;
 $positions: static, relative, absolute, fixed, sticky !default;
+$user-selects: all, auto, none !default;
 
 
 // Printing
diff --git a/assets/stylesheets/bootstrap/mixins/_background-variant.scss b/assets/stylesheets/bootstrap/mixins/_background-variant.scss
index 3ceb5c5..8058018 100644
--- a/assets/stylesheets/bootstrap/mixins/_background-variant.scss
+++ b/assets/stylesheets/bootstrap/mixins/_background-variant.scss
@@ -15,8 +15,9 @@
   @include deprecate("The `bg-variant` mixin", "v4.4.0", "v5", $ignore-warning);
 }
 
-@mixin bg-gradient-variant($parent, $color) {
+@mixin bg-gradient-variant($parent, $color, $ignore-warning: false) {
   #{$parent} {
     background: $color linear-gradient(180deg, mix($body-bg, $color, 15%), $color) repeat-x !important;
   }
+  @include deprecate("The `bg-gradient-variant` mixin", "v4.5.0", "v5", $ignore-warning);
 }
diff --git a/assets/stylesheets/bootstrap/mixins/_border-radius.scss b/assets/stylesheets/bootstrap/mixins/_border-radius.scss
index 88aeb37..aee9bf3 100644
--- a/assets/stylesheets/bootstrap/mixins/_border-radius.scss
+++ b/assets/stylesheets/bootstrap/mixins/_border-radius.scss
@@ -1,9 +1,22 @@
 // stylelint-disable property-blacklist
 // Single side border-radius
 
+// Helper function to replace negative values with 0
+@function valid-radius($radius) {
+  $return: ();
+  @each $value in $radius {
+    @if type-of($value) == number {
+      $return: append($return, max($value, 0));
+    } @else {
+      $return: append($return, $value);
+    }
+  }
+  @return $return;
+}
+
 @mixin border-radius($radius: $border-radius, $fallback-border-radius: false) {
   @if $enable-rounded {
-    border-radius: $radius;
+    border-radius: valid-radius($radius);
   }
   @else if $fallback-border-radius != false {
     border-radius: $fallback-border-radius;
@@ -12,52 +25,52 @@
 
 @mixin border-top-radius($radius) {
   @if $enable-rounded {
-    border-top-left-radius: $radius;
-    border-top-right-radius: $radius;
+    border-top-left-radius: valid-radius($radius);
+    border-top-right-radius: valid-radius($radius);
   }
 }
 
 @mixin border-right-radius($radius) {
   @if $enable-rounded {
-    border-top-right-radius: $radius;
-    border-bottom-right-radius: $radius;
+    border-top-right-radius: valid-radius($radius);
+    border-bottom-right-radius: valid-radius($radius);
   }
 }
 
 @mixin border-bottom-radius($radius) {
   @if $enable-rounded {
-    border-bottom-right-radius: $radius;
-    border-bottom-left-radius: $radius;
+    border-bottom-right-radius: valid-radius($radius);
+    border-bottom-left-radius: valid-radius($radius);
   }
 }
 
 @mixin border-left-radius($radius) {
   @if $enable-rounded {
-    border-top-left-radius: $radius;
-    border-bottom-left-radius: $radius;
+    border-top-left-radius: valid-radius($radius);
+    border-bottom-left-radius: valid-radius($radius);
   }
 }
 
 @mixin border-top-left-radius($radius) {
   @if $enable-rounded {
-    border-top-left-radius: $radius;
+    border-top-left-radius: valid-radius($radius);
   }
 }
 
 @mixin border-top-right-radius($radius) {
   @if $enable-rounded {
-    border-top-right-radius: $radius;
+    border-top-right-radius: valid-radius($radius);
   }
 }
 
 @mixin border-bottom-right-radius($radius) {
   @if $enable-rounded {
-    border-bottom-right-radius: $radius;
+    border-bottom-right-radius: valid-radius($radius);
   }
 }
 
 @mixin border-bottom-left-radius($radius) {
   @if $enable-rounded {
-    border-bottom-left-radius: $radius;
+    border-bottom-left-radius: valid-radius($radius);
   }
 }
diff --git a/assets/stylesheets/bootstrap/mixins/_buttons.scss b/assets/stylesheets/bootstrap/mixins/_buttons.scss
index c82c4d6..d6235aa 100644
--- a/assets/stylesheets/bootstrap/mixins/_buttons.scss
+++ b/assets/stylesheets/bootstrap/mixins/_buttons.scss
@@ -20,10 +20,10 @@
     color: color-yiq($hover-background);
     @include gradient-bg($hover-background);
     border-color: $hover-border;
-    // Avoid using mixin so we can pass custom focus shadow properly
     @if $enable-shadows {
-      box-shadow: $btn-box-shadow, 0 0 0 $btn-focus-width rgba(mix(color-yiq($background), $border, 15%), .5);
+      @include box-shadow($btn-box-shadow, 0 0 0 $btn-focus-width rgba(mix(color-yiq($background), $border, 15%), .5));
     } @else {
+      // Avoid using mixin so we can pass custom focus shadow properly
       box-shadow: 0 0 0 $btn-focus-width rgba(mix(color-yiq($background), $border, 15%), .5);
     }
   }
@@ -51,10 +51,10 @@
     border-color: $active-border;
 
     &:focus {
-      // Avoid using mixin so we can pass custom focus shadow properly
       @if $enable-shadows and $btn-active-box-shadow != none {
-        box-shadow: $btn-active-box-shadow, 0 0 0 $btn-focus-width rgba(mix(color-yiq($background), $border, 15%), .5);
+        @include box-shadow($btn-active-box-shadow, 0 0 0 $btn-focus-width rgba(mix(color-yiq($background), $border, 15%), .5));
       } @else {
+        // Avoid using mixin so we can pass custom focus shadow properly
         box-shadow: 0 0 0 $btn-focus-width rgba(mix(color-yiq($background), $border, 15%), .5);
       }
     }
@@ -90,10 +90,10 @@
     border-color: $active-border;
 
     &:focus {
-      // Avoid using mixin so we can pass custom focus shadow properly
       @if $enable-shadows and $btn-active-box-shadow != none {
-        box-shadow: $btn-active-box-shadow, 0 0 0 $btn-focus-width rgba($color, .5);
+        @include box-shadow($btn-active-box-shadow, 0 0 0 $btn-focus-width rgba($color, .5));
       } @else {
+        // Avoid using mixin so we can pass custom focus shadow properly
         box-shadow: 0 0 0 $btn-focus-width rgba($color, .5);
       }
     }
diff --git a/assets/stylesheets/bootstrap/mixins/_forms.scss b/assets/stylesheets/bootstrap/mixins/_forms.scss
index 418470d..57c2d79 100644
--- a/assets/stylesheets/bootstrap/mixins/_forms.scss
+++ b/assets/stylesheets/bootstrap/mixins/_forms.scss
@@ -16,10 +16,10 @@
     background-color: $input-focus-bg;
     border-color: $input-focus-border-color;
     outline: 0;
-    // Avoid using mixin so we can pass custom focus shadow properly
     @if $enable-shadows {
-      box-shadow: $input-box-shadow, $input-focus-box-shadow;
+      @include box-shadow($input-box-shadow, $input-focus-box-shadow);
     } @else {
+      // Avoid using mixin so we can pass custom focus shadow properly
       box-shadow: $input-focus-box-shadow;
     }
   }
diff --git a/assets/stylesheets/bootstrap/mixins/_grid-framework.scss b/assets/stylesheets/bootstrap/mixins/_grid-framework.scss
index 8e291f7..191fb56 100644
--- a/assets/stylesheets/bootstrap/mixins/_grid-framework.scss
+++ b/assets/stylesheets/bootstrap/mixins/_grid-framework.scss
@@ -15,12 +15,15 @@
   @each $breakpoint in map-keys($breakpoints) {
     $infix: breakpoint-infix($breakpoint, $breakpoints);
 
-    // Allow columns to stretch full width below their breakpoints
-    @for $i from 1 through $columns {
-      .col#{$infix}-#{$i} {
-        @extend %grid-column;
+    @if $columns > 0 {
+      // Allow columns to stretch full width below their breakpoints
+      @for $i from 1 through $columns {
+        .col#{$infix}-#{$i} {
+          @extend %grid-column;
+        }
       }
     }
+
     .col#{$infix},
     .col#{$infix}-auto {
       @extend %grid-column;
@@ -31,12 +34,15 @@
       .col#{$infix} {
         flex-basis: 0;
         flex-grow: 1;
+        min-width: 0; // See https://github.com/twbs/bootstrap/issues/25410
         max-width: 100%;
       }
 
-      @for $i from 1 through $grid-row-columns {
-        .row-cols#{$infix}-#{$i} {
-          @include row-cols($i);
+      @if $grid-row-columns > 0 {
+        @for $i from 1 through $grid-row-columns {
+          .row-cols#{$infix}-#{$i} {
+            @include row-cols($i);
+          }
         }
       }
 
@@ -44,9 +50,11 @@
         @include make-col-auto();
       }
 
-      @for $i from 1 through $columns {
-        .col#{$infix}-#{$i} {
-          @include make-col($i, $columns);
+      @if $columns > 0 {
+        @for $i from 1 through $columns {
+          .col#{$infix}-#{$i} {
+            @include make-col($i, $columns);
+          }
         }
       }
 
@@ -58,11 +66,13 @@
         .order#{$infix}-#{$i} { order: $i; }
       }
 
-      // `$columns - 1` because offsetting by the width of an entire row isn't possible
-      @for $i from 0 through ($columns - 1) {
-        @if not ($infix == "" and $i == 0) { // Avoid emitting useless .offset-0
-          .offset#{$infix}-#{$i} {
-            @include make-col-offset($i, $columns);
+      @if $columns > 0 {
+        // `$columns - 1` because offsetting by the width of an entire row isn't possible
+        @for $i from 0 through ($columns - 1) {
+          @if not ($infix == "" and $i == 0) { // Avoid emitting useless .offset-0
+            .offset#{$infix}-#{$i} {
+              @include make-col-offset($i, $columns);
+            }
           }
         }
       }
diff --git a/assets/stylesheets/bootstrap/mixins/_transition.scss b/assets/stylesheets/bootstrap/mixins/_transition.scss
index 8ce35a6..54553de 100644
--- a/assets/stylesheets/bootstrap/mixins/_transition.scss
+++ b/assets/stylesheets/bootstrap/mixins/_transition.scss
@@ -1,16 +1,26 @@
 // stylelint-disable property-blacklist
 @mixin transition($transition...) {
+  @if length($transition) == 0 {
+    $transition: $transition-base;
+  }
+
+  @if length($transition) > 1 {
+    @each $value in $transition {
+      @if $value == null or $value == none {
+        @warn "The keyword 'none' or 'null' must be used as a single argument.";
+      }
+    }
+  }
+
   @if $enable-transitions {
-    @if length($transition) == 0 {
-      transition: $transition-base;
-    } @else {
+    @if nth($transition, 1) != null {
       transition: $transition;
     }
-  }
 
-  @if $enable-prefers-reduced-motion-media-query {
-    @media (prefers-reduced-motion: reduce) {
-      transition: none;
+    @if $enable-prefers-reduced-motion-media-query and nth($transition, 1) != null and nth($transition, 1) != none {
+      @media (prefers-reduced-motion: reduce) {
+        transition: none;
+      }
     }
   }
 }
diff --git a/assets/stylesheets/bootstrap/utilities/_background.scss b/assets/stylesheets/bootstrap/utilities/_background.scss
index a997b1b..3accbc4 100644
--- a/assets/stylesheets/bootstrap/utilities/_background.scss
+++ b/assets/stylesheets/bootstrap/utilities/_background.scss
@@ -6,7 +6,7 @@
 
 @if $enable-gradients {
   @each $color, $value in $theme-colors {
-    @include bg-gradient-variant(".bg-gradient-#{$color}", $value);
+    @include bg-gradient-variant(".bg-gradient-#{$color}", $value, true);
   }
 }
 
diff --git a/assets/stylesheets/bootstrap/utilities/_interactions.scss b/assets/stylesheets/bootstrap/utilities/_interactions.scss
new file mode 100644
index 0000000..cc75fc2
--- /dev/null
+++ b/assets/stylesheets/bootstrap/utilities/_interactions.scss
@@ -0,0 +1,5 @@
+// stylelint-disable declaration-no-important
+
+@each $value in $user-selects {
+  .user-select-#{$value} { user-select: $value !important; }
+}
diff --git a/assets/stylesheets/bootstrap/utilities/_text.scss b/assets/stylesheets/bootstrap/utilities/_text.scss
index 5d0f1c8..d2b2a22 100644
--- a/assets/stylesheets/bootstrap/utilities/_text.scss
+++ b/assets/stylesheets/bootstrap/utilities/_text.scss
@@ -63,8 +63,7 @@
 .text-decoration-none { text-decoration: none !important; }
 
 .text-break {
-  word-break: break-word !important; // IE & < Edge 18
-  overflow-wrap: break-word !important;
+  word-wrap: break-word !important;
 }
 
 // Reset
-- 
cgit v1.2.3