Revisit about adding `RenderWidgetHostDelegate::PreHandleMouseEvent()`
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simonhong commented
Description
We depend on this method to get mouse move event for toggle sidebar UI when its option is on mouseover.
W/o this hook, we need invisible widget over web contents area because web contents consumes mouse event first.
Check we can have current on mouseover behavior w/o this hook.
It was upstream hook but it's deleted in cr141 as there is no user for this hook in upstream.