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So when accepting/declining a meeting invite if you type space it goes through the message list rather than putting the space in the comment. evolution-3.21.92-1.fc25.x86_64 evolution-data-server-3.21.92-1.fc25.x86_64 evolution-ews-3.21.92-1.fc25.x86_64
Thanks for a bug report. I can confirm it, together with other keys, like comma (','), which cannot be added to the comment area.
I moved this upstream as [1], for better visibility. Please see [1] for any further updates. [1] https://bugzilla.gnome.org/show_bug.cgi?id=771651