Merge branch 'mjog/1126-dot-stuffing' into 'gnome-3-38'
Fix email being sent truncated after a line starting with a dot.
Closes #1126 (closed)
See merge request !647 (merged)
(cherry picked from commit e99115e9)
1987582b Geary.Smtp.ClientConnection: Documentation fixes cc5d4ffa Geary.Smtp.ClientSession: Ensure SMTP data is sent dot-stuffed