Resolves: tdf#123175 don't use NWF to draw buttons with an overridden bg

Change-Id: I434f476f62c5c754d96eeb0cb9ad7c0b8d38ccec
Reviewed-on: https://gerrit.libreoffice.org/70069
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

vcl/source/control/button.cxx

@@ -1018,7 +1018,8 @@ void PushButton::ImplDrawPushButton(vcl::RenderContext& rRenderContext)
         if (!bRollOver && !HasFocus())
             bDrawMenuSep = false;
     }
-    bNativeOK = rRenderContext.IsNativeControlSupported(ControlType::Pushbutton, ControlPart::Entire);
+    // tdf#123175 if there is a custom control bg set, draw the button without outsourcing to the NWF
+    bNativeOK = !IsControlBackground() && rRenderContext.IsNativeControlSupported(ControlType::Pushbutton, ControlPart::Entire);
     if (bNativeOK)
     {
         PushButtonValue aControlValue;