in case dialog is created with previously entered text

make VirtualFileVisitorTest test the real symlinks (with correct getPath() unlike the MockVirtualFile), check that iterator doesn't visit multiple times

RemoveScheme action on external change — do not schedule scheme file removing because file was already removed

IDEA-209951 Inspection to detect when collection is accidentally passed as vararg and will be wrapped into one-element array

Moves it up the startup tasks list; executes it only on existing installations; updates plugins first.

reduce risk of accidental scheme file removing — `removeExternalizableSchemesFromRuntimeState` method is used to reflect already performed changes on disk, so, `isScheduleToDelete = false` is passed to `retainExternalInfo`

now languages can retrieve everything expensive during daemon and not in ReferenceImporter.autoImportReferenceAt on EDT

save: hold reflection members on hard reference to avoid unnecessary classloading/JIT on their recreation (IDEA-207243)

* do not allow typing during shelf;
* only one shelving process can performed at the same time;
* handle silent shelf cancellation - check if progress indicator was cancelled
 and don't log such case;

* provide readOnly reason to WritingAccessProvider and reuse it in ReadonlyStatusHandlerImpl;
* show tooltip with specified read only message in Document;