Bug 303341

I try to use the mouse as little as possible, and being able to avoid it while writing email is especially important. I also tend to use the "Sent-Mail" feature a lot, so that the messages I send are properly stored in the directories I want.

However, it is currently not possible to set the "Sent-Mail" folder using the keyboard -- if I just cycle through the elements in the composer with Tab and try using Enter on the little folder button, nothing happens, and I cannot type something in the input box with the Sent-Mail folder name.

I then went to Settings->Configure Shortcuts, and the only Sent-Mail-related shortcut available said "Sent-Mail folder", but it actually just toggles whether that field is shown on the composer or not.

Reproducible: Always

Steps to Reproduce:
1. Open the composer to write a new message
2. Go to "View" and make sure "Sent-Mail folder" is checked
3. Try changing its value with the keyboard
Actual Results:  
Nothing happens.

Expected Results:  
I am able to launch the dialog that allows me to change the Sent-Mail folder with the keyboard.