Assets/UI: Improve asset library Preferences UI

* Open File Browser when pressing "Add Asset Library". This just makes sense,
  since users have to select a directory for the asset library anyway.
* Move '+' icon back to the right side of the box. Then it is right under the
  'x' icons for each indivdual library, which seems like the more natural
  place.
* Correct tooltip for the "Add Asset Library" operator.
* Mark empty asset library name or paths field in red, to make clear that these
  need to be set.

1 files changed, 9 insertions, 3 deletions

diff --git a/release/scripts/startup/bl_ui/space_userpref.py b/release/scripts/startup/bl_ui/space_userpref.py
index bb3b3fbc23b..abd235f1c44 100644
--- a/release/scripts/startup/bl_ui/space_userpref.py
+++ b/release/scripts/startup/bl_ui/space_userpref.py
@@ -1410,12 +1410,18 @@ class USERPREF_PT_file_paths_asset_libraries(FilePathsPanel, Panel):
         row.label(text="Path")
 
         for i, library in enumerate(paths.asset_libraries):
-            name_col.prop(library, "name", text="")
+            row = name_col.row()
+            row.alert = not library.name
+            row.prop(library, "name", text="")
+
             row = path_col.row()
-            row.prop(library, "path", text="")
+            subrow = row.row()
+            subrow.alert = not library.path
+            subrow.prop(library, "path", text="")
             row.operator("preferences.asset_library_remove", text="", icon='X', emboss=False).index = i
+
         row = box.row()
-        row.alignment = 'LEFT'
+        row.alignment = 'RIGHT'
         row.operator("preferences.asset_library_add", text="", icon='ADD', emboss=False)