compose: Disable 'c' and 'x' hotkeys while compose is open.
compose: Disable 'c' and 'x' hotkeys while compose is open.

The most plausible situations through which one would press these
hotkeys with the compose box still open are accidents (basically,
you're trying to type but the browser focus is unexpectedly not in the
compose textarea).

So we disable these keyboard shortcuts when the compose box is open,
regardless of where keyboard focus lies.

Fixes #21128.

kou/zulip,zulip/zulip,zulip/zulip,andersk/zulip,andersk/zulip,rht/zulip,andersk/zulip,zulip/zulip,kou/zulip,andersk/zulip,kou/zulip,kou/zulip,zulip/zulip,rht/zulip,andersk/zulip,rht/zulip,rht/zulip,kou/zulip,zulip/zulip,zulip/zulip,kou/zulip,andersk/zulip,rht/zulip,kou/zulip,andersk/zulip,zulip/zulip,rht/zulip,rht/zulip