fdo#45671 fix for transparent colour split button

sc/source/ui/view/formatsh.cxx

@@ -1435,6 +1435,15 @@ void ScFormatShell::ExecuteAttr( SfxRequest& rReq )
                 pTabViewShell->ExecuteCellFormatDlg( rReq, TP_FONT );       // wenn ToolBar vertikal
                 break;
 
+            case SID_BACKGROUND_COLOR:
+                {
+                    SvxBrushItem aBrushItem( (const SvxBrushItem&)
+                                     pTabViewShell->GetSelectionPattern()->GetItem( ATTR_BACKGROUND ) );
+                    aBrushItem.SetColor( COL_TRANSPARENT );
+                    pTabViewShell->ApplyAttr( aBrushItem );
+                }
+                break;
+
             case SID_ATTR_ALIGN_LINEBREAK:                  // ohne Parameter als Toggle
                 {
                     const ScPatternAttr* pAttrs = pTabViewShell->GetSelectionPattern();

svx/source/tbxctrls/tbcontrl.cxx

@@ -2250,6 +2250,10 @@ SvxColorExtToolBoxControl::SvxColorExtToolBoxControl(
     switch( nSlotId )
     {
         case SID_ATTR_CHAR_COLOR:
+            addStatusListener( OUString( RTL_CONSTASCII_USTRINGPARAM( ".uno:Color" )));
+            nMode = TBX_UPDATER_MODE_CHAR_COLOR_NEW;
+            break;
+
         case SID_ATTR_CHAR_COLOR2:
             addStatusListener( OUString( RTL_CONSTASCII_USTRINGPARAM( ".uno:CharColorExt" )));
             nMode = TBX_UPDATER_MODE_CHAR_COLOR_NEW;