Speed up filesystem dock operations #87917
Draft
+259
−68
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Fixes #50576
godot.windows.editor.dev.x86_64_JhN90GK3xC.mp4
Moving, duplicating, renaming and creating folders is now instant.
In fact it's just a trick - the Tree is updated instantly upon action, but the rescan still runs in the background. When it finishes, it causes Tree sync with the actual filesystem. There are still some bugs like files appearing in wrong place or wrong selections, so putting as draft.