Fix bindings.key_mappings with multiple keys

Otherwise, when e.g. doing "<Meta+Up>": "gg" in bindings.key_mappings,
there's a crash like:

    Traceback (most recent call last):
      File "/usr/lib/python3.9/site-packages/qutebrowser/keyinput/eventfilter.py", line 105, in eventFilter
        return handler(typing.cast(QKeyEvent, event))
      File "/usr/lib/python3.9/site-packages/qutebrowser/keyinput/eventfilter.py", line 75, in _handle_key_event
        return man.handle_event(event)
      File "/usr/lib/python3.9/site-packages/qutebrowser/keyinput/modeman.py", line 462, in handle_event
        return handler(cast(QKeyEvent, event))
      File "/usr/lib/python3.9/site-packages/qutebrowser/keyinput/modeman.py", line 283, in _handle_keypress
        match = parser.handle(event, dry_run=dry_run)
      File "/usr/lib/python3.9/site-packages/qutebrowser/keyinput/modeparsers.py", line 105, in handle
        match = super().handle(e, dry_run=dry_run)
      File "/usr/lib/python3.9/site-packages/qutebrowser/keyinput/basekeyparser.py", line 309, in handle
        result = self._match_key_mapping(result.sequence)
      File "/usr/lib/python3.9/site-packages/qutebrowser/keyinput/basekeyparser.py", line 246, in _match_key_mapping
        mapped = sequence.with_mappings(
      File "/usr/lib/python3.9/site-packages/qutebrowser/keyinput/keyutils.py", line 675, in with_mappings
        assert len(new_seq) == 1
    AssertionError

While this isn't the intended way to use this setting, we shouldn't
crash - and let's just make it work instead of forbidding it.

(cherry picked from commit 5b6d2c60b46e233d4788a9b34d15fdb7d8d1c114)

0 files changed, 0 insertions, 0 deletions