Anyway, I've opened a pull request with this fix:
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Even if you won't decide to merge it, then maybe it will be useful for someone struggling with this issue.
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And one thing unrelated directly to the main topic: when playing with my fresh build based on your recent main I've noticed that when I'm executing 'Send' for selected message, button with "Stop" is not visible on the bottom bar (in last tagged version 0.28.0 there was a button "Stop" or sth like that...):
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But, when hitting this empty button - TX is stopped.