A plugin command that takes seconds (an LLM call that fills the commit message) gave no
sign at the button that the click was taken, and a second click started a second run.
Actions may now set `indicatesRunning`: the action runner counts their in-flight runs
and an IconButton bound to such an action shows a spinner, sets aria-busy and ignores
clicks until the run settles. Plugin commands set it, so every toolbar slot that draws
them (editor.title, mainToolbar, commit.message) is covered without a plugin API change
and without features importing each other. The button stays focusable (aria-disabled,
not disabled). Spinner moves to its own module so Button can use it without a cycle
with Feedback, which re-exports it.
Refs #2254
Co-authored-by: NguyenBang <nguyenbang@Mac.lan>
ntbang0901andNguyenBang
l0ng-ai