make menu item order explicit with 'order' property (default to 0)
make group order be the natural string order with exceptions for 'navigation' (always first) and falsy groups (always last)

Folding icon collides with git decorations: Create a div per linedecoration

This reverts commit eae1a2f1.

reparent editor container for #8579

Fix debounceEvent

Several CJK strings on the UI are very difficult to read on standard definition monitors due to font weight and size (fixes #8653)

fixes #8265

fixes #8224

fixes #8621

bug: need to update editor group toolbar when changing active tab, otherwise split action can go missing

related to #8621

Migrate EditorActions wrt context menu