Minor bug - duplicated text clip name

Thanks for the latest improvements in naming clip when duplication is used.
But there is still one minor bug.
When you repeatedly duplicate name, it still named the same, ie duplicate "title" you get "title#2" - this is OK, duplicate "title" again you get again "title#2" - that is the bug.

There should be some "unique name detection mechanism" - let's have a list of all used names and for every new name (new text clip) test the list for existence of the particular name. If exists, try to increase number behind #.