- Every committed document edit (annotations and form entries) pushes the
previous state onto a bounded history, so ctrl-z, the annotation
palette's Undo button, and the context menu's "Undo Edit" walk back
through them; undoing past the first edit returns to the file's bytes.
- Right clicking an annotation offers "Delete Annotation". The engine
lists a page's markup annotations (links, widgets, and popups are
excluded) and removes the one under the pointer by its annotation index.
- The palette's Undo button is disabled while the history is empty, and
every edit clears the annotation cache that hit testing reads.
yenru0
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