Add overlays and use it for tooltips #195
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This adds overlays which are views which are on top of all other views in a window. They can be created using
add_overlayandremove_overlay. It's intended to replace z-order for use with popups, drop down menus, tooptips, etc. as it works with events and the tiny-skia backend (and in the future, vello).They are currently implemented using
WindowViewwhich is the new root view of a window. It contains the main application view and a number of overlays. Ideally these overlays should be their own windows, but that would require some work to avoid rendering setup for each window.The
tooltipview is changed to use these.