allow disabling spell checking
I'm running Geary from git mainline on Ubuntu 19.04.
Geary now spell checks as I type, and draws a red underline under any word it thinks I have misspelled. This behavior is annoying to me personally. I can spell well on my own, and many words I use aren't in common dictionaries (e.g. proper names). I'd like to turn it off, but there is apparently no option for that. Please allow me to disable spell checking - thanks!