Button redraw bug

[jasonKercher]

From setPressed legato_widget_button.c:

    // try to find a reason to redraw
    if(_this->pressedImage != NULL && 
       _this->pressedImage != _this->releasedImage)
    {
        dirty = LE_TRUE;
    }
       
    if(_this->widget.style.borderType == LE_WIDGET_BORDER_BEVEL)
    {
        dirty = LE_TRUE;
    }
        
    if(_this->pressedOffset != 0 &&
       (_this->pressedImage != NULL ||
       (_this->string != NULL && _this->string->fn->isEmpty(_this->string) == LE_FALSE)))
    {
        dirty = LE_TRUE;
    }
        
    if(dirty == LE_TRUE)
    {
        _this->fn->invalidate(_this);
    }

What happens if dirty never goes true because of all the reasons above, and we didn't check the scheme background vs base?