Speed ups the typical use cases that can profit from this:
* Change a header file and switch then to source file
* Open documents one after the other (Follow Symbol)
* Change documents visible in splits (e.g. by refactoring action)
* Restore a session with multiple splits
Fixes the test ClangIpcServer.GetCodeCompletionDependingOnArgumets.
Change-Id: Ia575bd59780df14146dfc091a4d48794e4a0543d
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>
...for consistency and to avoid future file name clashes.
Change-Id: If595c8debfa1ceb01a1bb0ed34649fa513660503
Reviewed-by: Marco Bubke <marco.bubke@theqtcompany.com>
