I figured that the unexpected comma, is actually inserted on purpose when the "CC" or "TO" input fields get focus.
Though it might be a bit surprising that Evolution inserts a comma automatically (even when no valid mail exists in the input field), that is actually a feature.
The root cause of this bug, seems to be that the input fields get unfocused for a short time and then get focus again.
I found several other bugs related to this issue, which might be caused by the exact same bug:
I figured that the unexpected comma, is actually inserted on purpose when the "CC" or "TO" input fields get focus.
Though it might be a bit surprising that Evolution inserts a comma automatically (even when no valid mail exists in the input field), that is actually a feature.
The root cause of this bug, seems to be that the input fields get unfocused for a short time and then get focus again.
I found several other bugs related to this issue, which might be caused by the exact same bug:
Bug #971462 (Duplicate) -> Bug #971462 (Invalid) askubuntu. com/questions/ 399518/ guake-terminal- hiding- on-altgr- cant-type- pipes
Bug #1233458 (New)
Bug #1292796 (Confirmed)
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