Kermit requires ctrl-backslash to exit. On a Finnish/Swedish keyboard backslash requires you to press Alt-GR + "+" . If you do this together with control now it will generate Ctrl-"+" , which enlarges the font. Worked earlier at some point.
Thanks for the bug report and apologies for the late reply. Are you able to confirm if this issue persists on a current version of konsole?
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No. It seems to work again now. You can close this bug.
Thanks for the update; changing status.