Thank you for your great project. Geany is very handy. I use it on my Ubuntu installation, got Geany 1.23 from geany-dev PPA.
On Windows I used Notepad++ and I remember, that it has a checkbox "Follow current doc." near Directory path selector. It's very useful.
Let me illustrate:
1. I search some text in files of a parent folder with subfolders
2. I found what i was interested in
3. I tried to do new search in parent folder (but Directory points to last file directory), I selected parent directory and pressed Search.
4. Go to 1
In Notepad++ with unmarked checkbox "Follow current doc." I do not need to reselect parent folder (p. 3).
I hope you will understand my opinion and implement this checkbox in Geany.
With best regards,