Gap between sidebar and side panel when auto-hide is enabled
I guess the gap = shadow effect
I reported earlier https://forums.opera.com/post/398368
that sometimes panel can't be closed due to the too wide shadow effect.
But I noticed that menus/dropdowns can be closed without problem if clicking on the shadow (the shadow area is active). But it doesn't work in case of the sidebar panel.
*So I guess the menu's shadow effect better suits for using with the panel (if it is possible).
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