Outliner: Collection icon color tweaks

The icons originally chosen for the collection colors were selected
during development and had a few issues with contrast in the light
theme, and the gray color was not a good choice against the default gray
backgrounds.

The new colors are more readable in both default Blender themes. Gray
was replaced with pink.

Differential Revision: https://developer.blender.org/D9504

release/datafiles/userdef/userdef_default_theme.c

@@ -1108,28 +1108,28 @@ const bTheme U_theme_default = {
   },
   .collection_color = {
     {
-      .color = RGBA(0xe4312bff),
+      .color = RGBA(0xe2605bff),
     },
     {
-      .color = RGBA(0xef7e42ff),
+      .color = RGBA(0xf1a355ff),
     },
     {
-      .color = RGBA(0xe4dd52ff),
+      .color = RGBA(0xf1dc55ff),
     },
     {
-      .color = RGBA(0x9ac546ff),
+      .color = RGBA(0x7bcc7bff),
     },
     {
-      .color = RGBA(0x46bcc2ff),
+      .color = RGBA(0x5db6eaff),
     },
     {
-      .color = RGBA(0x8b65dcff),
+      .color = RGBA(0x8d59daff),
     },
     {
-      .color = RGBA(0x999999ff),
+      .color = RGBA(0xc673b8ff),
     },
     {
-      .color = RGBA(0x06d4432ff),
+      .color = RGBA(0x7a5441ff),
     },
   },
 };

release/scripts/presets/interface_theme/blender_light.xml

@@ -1454,6 +1454,40 @@
         >
       </ThemeBoneColorSet>
     </bone_color_sets>
+    <collection_color>
+      <ThemeCollectionColor
+        color="#dd473f"
+        >
+      </ThemeCollectionColor>
+      <ThemeCollectionColor
+        color="#e5a057"
+        >
+      </ThemeCollectionColor>
+      <ThemeCollectionColor
+        color="#e4d050"
+        >
+      </ThemeCollectionColor>
+      <ThemeCollectionColor
+        color="#3fb931"
+        >
+      </ThemeCollectionColor>
+      <ThemeCollectionColor
+        color="#3887c7"
+        >
+      </ThemeCollectionColor>
+      <ThemeCollectionColor
+        color="#844fcd"
+        >
+      </ThemeCollectionColor>
+      <ThemeCollectionColor
+        color="#c169b5"
+        >
+      </ThemeCollectionColor>
+      <ThemeCollectionColor
+        color="#7a5441"
+        >
+      </ThemeCollectionColor>
+    </collection_color>
   </Theme>
   <ThemeStyle>
     <panel_title>

source/blender/blenloader/intern/versioning_userdef.c

@@ -257,6 +257,9 @@ static void do_versions_theme(const UserDef *userdef, bTheme *btheme)
    */
   {
     /* Keep this block, even when empty. */
+    for (int i = 0; i < COLLECTION_COLOR_TOT; ++i) {
+      FROM_DEFAULT_V4_UCHAR(collection_color[i].color);
+    }
   }
 
 #undef FROM_DEFAULT_V4_UCHAR