message: Make RichResourceTextMouseEvent only respond to left button clicks
  Previously it prevented context menus from working when activated over
  a rich resource text field.
diff: @@ -655,6 +655,10 @@ bool RichResourceTextMouseEvent(const QWidget *owner, const QVariant &var, QRect
  if(event->type() != QEvent::MouseButtonRelease && event->type() != QEvent::MouseMove)
  return false;
  + // only process left button clicks
  + if(event->type() == QEvent::MouseButtonRelease && event->button() != Qt::LeftButton)
  + return false;
  +
  // special case handling for ResourceId/GPUAddress on its own
  if(var.userType() == qMetaTypeId<ResourceId>() || var.userType() == qMetaTypeId<GPUAddressPtr>())
  {
  