Always enable action pop-up button in find window

Previously it was only available when doing folder searches, since the items are for folder search behavior and results.

However, with “Find All” in document, we get a similar result list from which we may want to copy matches.
Match (potential) file chooser glob against full file path

Previously we would try full path, relative path, and just the name. This was done to determine wether or not the display string should include full path details or be limited to the name. The problem is that an excluding glob may require the full path, and would thus not exclude items that did match when using just the item’s name.
Improve handling of empty braces in globs

We treat empty braces as literal characters though do balance them.