UI: Consistent Area Move Snapping Locations

Change Area Move snapping locations to even 12ths, rather than current
eights and thirds, so snap distances are consistent sizes. Also adds
snapping at minimum and maximum locations.

see D11938 for details and illustrations.

Differential Revision: https://developer.blender.org/D11938

Reviewed by Hans Goudey

1 files changed, 13 insertions, 13 deletions

diff --git a/source/blender/editors/screen/screen_ops.c b/source/blender/editors/screen/screen_ops.c
index cff3ecfbbd3..daac196a90c 100644
--- a/source/blender/editors/screen/screen_ops.c
+++ b/source/blender/editors/screen/screen_ops.c
@@ -1738,19 +1738,19 @@ static int area_snap_calc_location(const bScreen *screen,
       int snap_dist_best = INT_MAX;
       {
         const float div_array[] = {
-            /* Middle. */
-            1.0f / 2.0f,
-            /* Thirds. */
-            1.0f / 3.0f,
-            2.0f / 3.0f,
-            /* Quarters. */
-            1.0f / 4.0f,
-            3.0f / 4.0f,
-            /* Eighth. */
-            1.0f / 8.0f,
-            3.0f / 8.0f,
-            5.0f / 8.0f,
-            7.0f / 8.0f,
+            0.0f,
+            1.0f / 12.0f,
+            2.0f / 12.0f,
+            3.0f / 12.0f,
+            4.0f / 12.0f,
+            5.0f / 12.0f,
+            6.0f / 12.0f,
+            7.0f / 12.0f,
+            8.0f / 12.0f,
+            9.0f / 12.0f,
+            10.0f / 12.0f,
+            11.0f / 12.0f,
+            1.0f,
         };
         /* Test the snap to the best division. */
         for (int i = 0; i < ARRAY_SIZE(div_array); i++) {