Fix palette damage for tool buttons, fixes #4960 #316
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Currently, the ToolInvoker code passes the button child in such a way that the WidgetInvoker queues only the child's draw. In previous Gtk+ versions, this magically resulted in redrawing the parent as well. However, Gtk+ 3.20 is probably trying to save power and not randomly redraw widgets. To fix this, we must queue the redraw of the widget that we want to redraw explicitly.
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Currently, the ToolInvoker code passes the button child in such a
way that the WidgetInvoker queues only the child's draw. In previous
Gtk+ versions, this magically resulted in redrawing the parent as well.
However, Gtk+ 3.20 is probably trying to save power and not randomly
redraw widgets. To fix this, we must queue the redraw of the widget
that we want to redraw explicitly.
https://bugs.sugarlabs.org/ticket/4960