fixes #37351

fixes #38207

* Provide additional workspace API to add/remove workspace folders (for #35407)

* add/removeFolders => add/removeFolder

* make add/remove folder return a boolean

* use proper service for workspace editing

* workspac => workspace

* do not log promise canceled messages

* show confirm dialog

Add experimentalFuzzySearchBoost so we can test changes to the 'boost' parameter in the search query

Change in workbench.editor.openPositioning setting

* Fix wrong placement of 'e.g.'s in the description of `window.title` setting

* Fix the same error in configuration-editing

* Add template system for tab descriptions. (#12965)

* Add a boolean flag to onConfigurationChanged to prevent updates during initialization.

* - Change configuration key to 'workbench.editor.tabSubtitle'.
- Change configuration type to the enum ['default', 'short', 'medium', 'long']
- Move path logic into FileEditorInput.
- Move configuration handling into GroupService/ITabOptions.
- Refactor duplicate path shortening logic.

* Don't consider empty-string descriptions during de-duplication. Don't show subtitle when all descriptions are identical.

* Minor fixes and documentation.