Reviews and operations on the backend that support undoing can now be
committed immediately, so they will not be lost in the event of a crash.
This required tweaks to a few places:
- don't set collection mtime on save() unless changes were made in
Python, as otherwise we end up accidentally clearing the backend undo
queue
- autosave() is now run on every reset()
- garbage collection now runs in a timer, instead of relying on
autosave() to be run periodically
- use dataclasses for the review/checkpoint undo cases, instead of the
nasty ad-hoc list structure
- expose backend review undo to Python, and hook it into GUI
- redo is not currently exposed on the GUI, and the backend can only
cope with reviews done by the new scheduler at the moment
- the initial undo prototype code was bumping mtime/usn on undo, but
that was not ideal, as it was breaking the queue handling which expected
the mtime to match. The original rationale for bumping mtime/usn was
to avoid problems with syncing, but various operations like removing
a revlog can't be synced anyway - so we just need to ensure we clear the
undo queue prior to syncing
- SearchTerm -> SearchNode
- Operator -> Joiner; share between messages
- build_search_string() supports specifying AND/OR as a convenience
- group_searches() makes it easier to negate
That way, the caller doesn't have to hold a reference to the browser and
explicitly call it again, if it wants to search for something specific.
Also, if the browser was closed and opened for a single-card-search, it
now won't perform a redundant current-deck-search first.
- IdList could be re-used for a cids: search in the future if required.
- Embedding the message means it's easy to access from Python as
an attribute of SearchTerm.
Manually hide the editor's completer popup before accepting a short cut which changes the focus widget. Thus, work around the bug in PyQt 5.15 where a QLineEdit with open QCompleter popup won't get notified about focus changes handled by the Main Window, leading to inconsistent focus.
