Merge branch 'stashing' of https://github.com/Krzysztof-Cieslak/vscode into Krzysztof-Cieslak-stashing

* Use r+ with truncation when saving existing files

'w' doesn't work with hidden files.

Fixes: https://github.com/Microsoft/vscode/issues/931

* use r+ only if EPERM is caught

* add check for Windows

* move writing to a separate method

* nits

* remove string overload for options

* remove encoding property from writeFileAndFlush

Fix #30181. If the tokenization has not be executed for lines above pasted area, we do not force tokenization info as we do not wait for the tokenization to complete.

Add remove action for FolderMatch

Add a watchdog mechanism to detect when the extension host JavaScript event loop is unresponsive (#26445)

Add empty problem matcher to "Run Dev" task

Fix spelling of "registered"

Fix spelling of "taskDefinitions"

Improve "uninstall first" messaging/grammar

Enable extensionHost debugging with --inspect