Hides the top bar, except in overview. However, there is an option to show the panel whenever the mouse pointer approaches the edge of the screen. And if "intellihide" is enabled, the panel only hides when a window takes the space. - Press backspace to remove keyboard shortcut. - Log off and on again when there is an error after upgrading.
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Mainly these changes: 1. Retrieve panel height dynamically on each hide-event in order to react on height changes (e.g. by user themes). 2. Hide not only panel itself but also the menus and buttons on the panel - necessary for "hot-corner" option. 3. Manage the panel opacity to get rid of the "rounded corners" (top left and right) when panel is hidden. 4. Some code cleanup (e.g. remove useless "const Lang", setting "const PANEL_ACTOR = Main.panel.actor;", function handleMenus)