Draw the separator for toolbuttons with separte popup menu on hover or focus

The only difference between the new instant-popup buttons and these when
flat is the color of the arrow, which is not a very good indicator. So
on hover, also draw the separator between the menu button and the main
button for these toolbuttons on hover or when it has focus, which makes
things a little clearer.

kstyle/breezestyle.cpp

@@ -3888,10 +3888,8 @@ namespace Breeze
 
         // store state
         const State& state( option->state );
-        const bool autoRaise( state & State_AutoRaise );
 
-        // do nothing for autoraise buttons
-        if( autoRaise || !(toolButtonOption->subControls & SC_ToolButtonMenu) ) return true;
+        if( !(toolButtonOption->subControls & SC_ToolButtonMenu) ) return true;
 
         // store palette and rect
         const auto& palette( option->palette );
@@ -3902,6 +3900,7 @@ namespace Breeze
         const bool hasFocus( enabled && ( state & ( State_HasFocus | State_Sunken ) ) );
         const bool mouseOver( enabled && ( state & State_MouseOver ) );
         const bool sunken( enabled && ( state & State_Sunken ) );
+        const bool flat( state & State_AutoRaise );
 
         // update animation state
         // mouse over takes precedence over focus
@@ -3922,14 +3921,20 @@ namespace Breeze
         frameRect = visualRect( option, frameRect );
 
         // render
-        _helper->renderButtonFrame( painter, frameRect, background, outline, shadow, hasFocus, sunken );
+        if ( !flat )
+        {
+            _helper->renderButtonFrame( painter, frameRect, background, outline, shadow, hasFocus, sunken );
+        }
 
         // also render separator
         auto separatorRect( rect.adjusted( 0, 2, -2, -2 ) );
         separatorRect.setWidth( 1 );
         separatorRect = visualRect( option, separatorRect );
         if( sunken ) separatorRect.translate( 1, 1 );
-        _helper->renderSeparator( painter, separatorRect, outline, true );
+        if ( !flat || mouseOver || hasFocus )
+        {
+            _helper->renderSeparator( painter, separatorRect, outline, true );
+        }
 
         return true;
 
@@ -6038,7 +6043,7 @@ namespace Breeze
         {
 
             copy.rect = menuRect;
-            if( !flat ) drawPrimitive( PE_IndicatorButtonDropDown, &copy, painter, widget );
+            drawPrimitive( PE_IndicatorButtonDropDown, &copy, painter, widget );
 
             if( sunken && !flat ) copy.rect.translate( 1, 1 );
             drawPrimitive( PE_IndicatorArrowDown, &copy, painter, widget );