In `Action.run` methods, we don't need an explicit null return value but can use undefined instead

part of strict null work

Improve column selection by setting origin to clicked position

es6 aftermath, static property of type X are created before decorating type X and therefore failing the instanceof-check

In conjunction with setting `editor.multiCursorModifier` to `ctrlCmd`, this yields a much more natural `alt+click` experience. The goofier `shift+alt+click` that is the default uses the _prior_ cursor position as the start point of the column selection.

Autocomplete/validation `args` for keybindings.json

Changed keybinding to select current line -issue 59003

Improves flipped cursor on line numbers

Give hover popups focus only when accessibility support is enabled