Interesting, I think this is happening because the mouse is extending into the explorer area, causing it to trigger a hover event for the explorer (which shows the icons). @isidorn, we should probably set a condition to not show when a drag event is happening.

This is not explorer specific but happens with all split views.
Forwarding to @sandy081

And yes @misolori you are probably right, the mouse goes over the view triggerin the css rule to show the action in the action bar on hover.

This applies to any hoverable element inside each splitview view: explorer action bars, debug breakpoint markers, line hovers, editor hovers, etc.

I've pushed a change which sets pointer-events: none in splitview views during sash resizes. cc @bpasero @sbatten for awareness, since it also affects the grid.