[TxMt] bug: find in project opens tab in wrong project

[Caio Chassot]

1. Open a project
2. Activate the Find in Project window
3. Search for a string that will match something
4. Open another project
5. Activate the Find in Project window
6. Click one of the matches

Observed:
A new tab appears on the second project, with no content window.

Expected:
The correct (first) project is brought to front (but behind the find 
window) and a tab is opened in it.