Put several addresses into your compose window. Resize the address list: http://imgur.com/92faF Now try to resize it smaller: http://imgur.com/c6lsc This seems to be a permanent state for the compose window now.
That's an interesting one. Using DOM Inspector, I can find the toolbox element with id="FormatToolbar" and change its height to something small to reset the location of the bar.
Err, I meant id="FormatToolbox"
Created attachment 563580 [details] [diff] [review] Fix this So the issue here is that, previously, the next sibling of the splitter had flex="1" so everything worked out. Then the splitter got moved above the FormatToolbox, which wasn't flexy. The solution is to make the flexy vbox encompass both the FormatToolbox and the message body. Here's a patch to do this, which is mostly indentation changes.
Comment on attachment 563580 [details] [diff] [review] Fix this r=me. Please also use hg transplant to put this on aurora & beta. I don't think this will adversely affect extensions, and I'd like to push the fix out as soon as possible.
Checked in: http://hg.mozilla.org/comm-central/rev/4ab5a3448398 http://hg.mozilla.org/releases/comm-aurora/rev/4cd6e224028d http://hg.mozilla.org/releases/comm-beta/rev/f3abe099d38e