GtkWidget implements connect() but pylint doesn't know that

Add open_window() which is more concise

We define the same shortcut for win.browse-history

Daniel Brötzmann authored 5 years ago and Philipp Hörist committed 5 years ago

- Light refactoring for adding actions

- Use event as var name instead of obj
- Use event_filter()
- Unify handler method names

- Group all event handlers
- Use event as var name instead of obj
- Use event_filter()
- Unify handler method names

- Group all event handlers
- Use event as var name instead of obj
- Use event_filter()
- Unify handler method names