Property Search: Add "search match" theme color

We will use a highlight on panel headers to convey that they have
a search match, so this commit initializes the theme color for the
properties editor.

Differential Revision: https://developer.blender.org/D8854

release/datafiles/userdef/userdef_default_theme.c

@@ -262,6 +262,7 @@ const bTheme U_theme_default = {
     .icon_folder = RGBA(0xe3c16eff),
   },
   .space_properties = {
+    .match = RGBA(0x5680c2ff),
     .back = RGBA(0x42424200),
     .title = RGBA(0xd4d4d4ff),
     .text = RGBA(0xe6e6e6ff),

release/scripts/presets/interface_theme/blender_light.xml

@@ -845,7 +845,9 @@
       </ThemeSequenceEditor>
     </sequence_editor>
     <properties>
-      <ThemeProperties>
+      <ThemeProperties
+        match="#5680c2"
+        >
         <space>
           <ThemeSpaceGeneric
             back="#b3b3b3"

source/blender/blenloader/intern/versioning_userdef.c

@@ -236,6 +236,8 @@ static void do_versions_theme(const UserDef *userdef, bTheme *btheme)
    */
   {
     /* Keep this block, even when empty. */
+
+    FROM_DEFAULT_V4_UCHAR(space_properties.match);
   }
 
 #undef FROM_DEFAULT_V4_UCHAR

source/blender/makesrna/intern/rna_userdef.c

@@ -2952,7 +2952,7 @@ static void rna_def_userdef_theme_space_node(BlenderRNA *brna)
 static void rna_def_userdef_theme_space_buts(BlenderRNA *brna)
 {
   StructRNA *srna;
-  //  PropertyRNA *prop;
+  PropertyRNA *prop;
 
   /* space_buts */
 
@@ -2961,6 +2961,11 @@ static void rna_def_userdef_theme_space_buts(BlenderRNA *brna)
   RNA_def_struct_clear_flag(srna, STRUCT_UNDO);
   RNA_def_struct_ui_text(srna, "Theme Properties", "Theme settings for the Properties");
 
+  prop = RNA_def_property(srna, "match", PROP_FLOAT, PROP_COLOR_GAMMA);
+  RNA_def_property_array(prop, 3);
+  RNA_def_property_ui_text(prop, "Search Match", "");
+  RNA_def_property_update(prop, 0, "rna_userdef_theme_update");
+
   rna_def_userdef_theme_spaces_main(srna);
 }