Comment 99 for bug 1084

This is a serious problem with much-needed and simple fix. Note the same
problem occurs with the attachment list -- it's particularly bad in the preview
pane. Having these panes expand to block out the entire message body (as it is
now) is unacceptable.

I would recommend either combining headers and attachments into the message
body pane as some have suggested, or keep them separate and add scroll bars.
If the latter, I would suggest that neither pane should ever auto-size to
anything larger than 1/3 of the available space.