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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 Jun 28, 2019 and Philipp Hörist committed Nov 14, 2019

- 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

Allow comparing attributes with different names

Example:
```
@event_filter(['account', 'jid=own_jid'])
def _on_event(self):
    pass
```

_on_event() is only executed if the event attribute `jid` matches the
`own_jid` attribute on self

There is no need to split functionality out into MessageControl because
all Controls use ChatControlBase. This simplifys the code.