#WEB-21581 fixed

These are local actions and we don't want their shortcuts to trigger some other action while search field is in focus (even if they have nothing to do).
We still want `update()` to mark actions as disabled on toolbar.

Issue:
* open "Commit Changes" dialog
* type "some commit message in a commit message editor"
* invoke search
* search for "comm", iterate over occurrences using "Enter"
* search for "comment", try to iterate over occurrences using "Enter"
* Bug: Dialog is closed, changes are committed (action is disabled and "Enter" is passed to the outer dialog, invoking `doOkAction()`)

Fixing performance issues found by Nastya here: https://youtrack.jetbrains.com/issue/CPP-4963#comment=27-1428213
– disabling OCGotoDeclarationHandler, because we have to work twice otherwise
– searching in text indices for a text of our element in CMakeCommandReference.resolve (instead of parsing/processing all the files)
- equals/hashcode in our references, so that ResolveCache would work

– fixing a few exceptions that sometimes appear during file editing

- minor helper method