Merge pull request #1375 from laerreal/rebase_remarks

Merge pull request #1375 from laerreal/rebase_remarks

* laerreal/rebase_remarks: (35 commits)
  CHANGES: document the Rebase Remarks feature from #1375
  i18n: update translations
  sequenceeditor: keep the Summary column elided
  diff: make the "apply patches" dialog slightly larger
  diff: display all files when a filename is deselected
  sequenceeditor: add docstrings
  sequenceditor: use constants for the column numbers
  sequenceditor: ensure that tasks are stopped in all situations
  sequenceditor: toggle each individual item's remarks
  sequenceditor: toggle each individual item
  sequenceeditor: use a plain old loop instead of tuple(map(...))
  sequenceeditor: use qtutils.SimpleTask instead of a raw Thread
  sequenceeditor: import "gitcmds" directly
  qtutils: add a wait() function to RunTask
  [pre-commit.ci] auto fixes from pre-commit.com hooks
  sequenceeditor: final actions moved to MainWindow
  sequenceeditor.Editor: inline sequencer instructions generation to `save`
  sequenceeditor.Editor: save (method) to helpers
  sequenceeditor.Editor: external_diff to signal callbacks
  sequenceeditor.Editor: poll_touched_paths_main to helpers
  ...

Resolves: #1375
Signed-off-by: David Aguilar <davvid@gmail.com>