These methods return an IEditor as a result but even if the opening fails or the editor was not opened as active.

The fix is to check for the result of the open call and only return the editor if the editor was opened actually.

This restores the behaviour we had before GRID.

fixes #64767

fixes #64735

This reverts commit 7d76da21.

fixes #64233

* Completely hide tab close button when dirty state is highlighted in top border

* Use :not selector to avoid code duplication

Try to better support handle of unicode in markdown by using a word definition that use unicode character class

Fixes #15177

fixes #64741

ref #64597

fixes #57788

debug: Do not hide debug hover when the mouse is pressed because it usually leads to accidental closing

fixes #64620

#64597