Before this change, the highlight module tracked only the most recent
plugin-owned entry in a scalar (_ZSH_AUTOSUGGEST_LAST_HIGHLIGHT) and
relied on a parameter-expansion subtraction to remove it:
region_highlight=("${(@)region_highlight:#$_ZSH_AUTOSUGGEST_LAST_HIGHLIGHT}")
That has two failure modes:
1. The tracked string is expanded as a zsh glob pattern. If the user's
ZSH_AUTOSUGGEST_HIGHLIGHT_STYLE contains characters like `#`
(e.g. `fg=#RRGGBB`), the entry is never removed and orphans
accumulate in region_highlight across redraws. See #789.
2. Only one entry can be tracked at a time. When apply is called
repeatedly without a successful reset (which happens under fast edits
and widget-wrapping interactions), every apply overwrites the tracked
reference and previous entries are orphaned.
Both manifest as stale suggestion colors bleeding onto accepted text,
typically in combination with zsh-syntax-highlighting (whose entries
interleave with ours in region_highlight).
Changes:
* Track every plugin-owned entry in an array
(_ZSH_AUTOSUGGEST_OWNED_HIGHLIGHTS).
* On zsh 5.9+, tag each entry with `memo=zsh-autosuggestions` and on
reset strip by memo in a single pass — robust regardless of how other
plugins manipulate region_highlight. This matches the mechanism
zsh-syntax-highlighting has used since 0.8.0.
* On zsh < 5.9, remove owned entries by literal string comparison
(loop, not pattern expansion) to avoid the `#`-as-glob issue.
* _ZSH_AUTOSUGGEST_LAST_HIGHLIGHT is retained and kept in sync for
backwards compatibility with any external consumer.
Adds spec/highlight_spec.rb covering:
- round-trip with a hex-colored style (regression for #789)
- reset does not touch foreign region_highlight entries
- accumulated orphans from repeated apply calls are all cleaned up
Supersedes #790 (which used `shift -p region_highlight` — incorrect
when another plugin has appended the most-recent entry).
Fixes#789, #698.
Daniel Portales