Log Message:
Update gedit3 to 3.10.4

Highlights:
- Implement regular expression search (Sébastien Wilmet)
- Use the GtkSourceView search and replace API (Sébastien Wilmet)
- Deprecate the gedit search and replace API (Sébastien Wilmet)
- Display the number of search occurrences and the current occurrence position
  in the search entry (Ignacio Casal Quinteiro, Sébastien Wilmet)
- Fix tab groups (Garrett Regier)
- Fix clicking on replace dialog buttons (Sébastien Wilmet)
- Add new Highlight Mode dialog (Ignacio Casal Quinteiro)
- Allow shell quotes in commands from Run Command tool (Adam Dingle)
- Use widget templates (Ignacio Casal Quinteiro, Paolo Borelli)
- Use revealer to animate the search bar and the notification bars (Ignacio \ 
Casal Quinteiro)
- Port to GtkApplication (Paolo Borelli, Ryan Lortie, Ignacio Casal Quinteiro)
- Port to python 3 (Ignacio Casal Quinteiro)
- Translation updates

For full release notes see:
https://git.gnome.org/browse/gedit/tree/NEWS?id=3.10.4