Changes

An attached message can be opened in its own message window<span style="text-decoration:line-through;">; however, doing so puts an '''error in the JavaScript console''' ([https://bugzilla.mozilla.org/show_bug.cgi?id=231282 bug 231282])</span><span style="background-color:lime;">Fixed for TB&nbsp;2.0</span>. All attachments of the "parent" message <span style="text-decoration:line-through;">(including the forwarded message itself)</span> are shown in that window's attachment panel ([https://bugzilla.mozilla.org/show_bug.cgi?id=203570 bug 203570]). Obversely, if the attached message itself has attachments, those are shown in the attachment panel of its "parent" message; showing all the attachments is considered a feature, but there is no visible means to distinguish which message contains which attachment ([https://bugzilla.mozilla.org/show_bug.cgi?id=35587 bug 35587]).

For both the opened attachment and the opened .EML file: