porcupine
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closing tab while error message is showing
https://github.com/Akuli/porcupine/blob/ed13a8264ccc3c222bfe52c3b3dc1389dc70d957/porcupine/tabs.py#L641
This isn't really enough to prevent the user from messing up something while the error message is showing and then clicking "Retry". The user can close the tab, for example, and that results in errors in terminal.