macosx: prevent color flashes when collapsing items in the sidebar (fixes #5600)

(cherry picked from commit f305a1f9df5a629171622e9bde03d19051267048)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

extras/package/macosx/Resources/English.lproj/MainMenu.xib

@@ -21,14 +21,14 @@
     </object>
     <object class="NSMutableArray" key="IBDocument.EditedObjectIDs">
       <bool key="EncodedWithXMLCoder">YES</bool>
+      <integer value="21"/>
+      <integer value="915"/>
       <integer value="4758"/>
-      <integer value="4722"/>
       <integer value="1617"/>
-      <integer value="4596"/>
-      <integer value="915"/>
       <integer value="2730"/>
       <integer value="4824"/>
-      <integer value="4756"/>
+      <integer value="4722"/>
+      <integer value="4596"/>
     </object>
     <object class="NSArray" key="IBDocument.PluginDependencies">
       <bool key="EncodedWithXMLCoder">YES</bool>
@@ -92,7 +92,6 @@
                               <string key="NSFrameSize">{121, 272}</string>
                               <reference key="NSSuperview" ref="18556274"/>
                               <int key="NSViewLayerContentsRedrawPolicy">2</int>
-                              <bool key="NSViewCanDrawConcurrently">YES</bool>
                               <bool key="NSEnabled">YES</bool>
                               <object class="_NSCornerView" key="NSCornerView">
                                 <nil key="NSNextResponder"/>
@@ -595,13 +594,13 @@
                   </object>
                   <string key="NSFrame">{{123, 0}, {481, 274}}</string>
                   <reference key="NSSuperview" ref="302568132"/>
+                  <bool key="NSViewIsLayerTreeHost">YES</bool>
                   <int key="NSViewLayerContentsRedrawPolicy">2</int>
                   <string key="NSClassName">NSView</string>
                 </object>
               </object>
               <string key="NSFrame">{{0, 36}, {604, 274}}</string>
               <reference key="NSSuperview" ref="429932428"/>
-              <bool key="NSViewIsLayerTreeHost">YES</bool>
               <int key="NSViewLayerContentsRedrawPolicy">2</int>
               <bool key="NSIsVertical">YES</bool>
               <int key="NSDividerStyle">2</int>