Redesign Find in Files logic:
The find properties/options are now visible in a non-modal dialog.
The results are shown as toolviews.
It is possible to have more than only one toolview, i.e. show several search results simultaneously.

To search in the same tab again, there is a button called "Refine search".
To close a tab (=toolview), there is an extra Close button.
Besides that, whie searching there is a small progress bar which indicates that the search is still in progress. Next to the progress bar is a small (x)-button to cancel the search (thread).

To invoke Find in Files go to Edit > Find in Files.
We should set a sane shortcut for this.

This solves the problem of a too cluttered Find in Files toolview.
The workflow should still be ok.

Discussed with Ellen and Jowenn - thanks :)