The block list is now a BlockStore. The file is replaced atomically (temporary
file, fsync, rename), created readable by the owner only, picked up again when it
changes on disk, and a word whose save failed stays hidden in memory and is
written on the next attempt instead of being lost on restart. Words with line
breaks or NUL, over 256 bytes, and lists over 20000 entries are refused.
Removing candidates from the engine's list resets its cursor to the first
candidate when the removal is in front of it, so the highlight jumped while
arrowing through candidates. The filter now puts the cursor back on the
candidate it was on.
Both parts are in headers that the window and the tests include, so the tests
exercise the code that runs: tests/blockstore_test.cpp covers restarts, failed
writes, outside edits and bad input, tests/blockfilter_test.cpp runs the filter
on a real Fcitx5 candidate list.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
