Bugzilla

## steps to reproduce:
1. expand the attachment pane (if not already expanded)
2. resize the attachment pane (by moving the horizontal divider upwards)
3. collapse the attachment pane

## expected results:
attachment pane should be collapsed, i.e. only the summary line should be visible (9 attachments, 29.3MB, save all)

## actual results:
See screenshots.
The attachment pane doesn't collapse, only the files are hidden. So a large empty gray area remains.

## deduping
Maybe a regression? There are [lots of similar bugs](https://bugzilla.mozilla.org/buglist.cgi?classification=Client%20Software&classification=Developer%20Infrastructure&classification=Components&classification=Server%20Software&classification=Other&v1=attachment&v3=%28resiz%7Cexpand%7Ccollaps%29&f1=short_desc&f3=short_desc&v2=pane&f2=short_desc&o3=regexp&o1=regexp&o2=regexp&list_id=16965626&query_format=advanced), but I couldn't find a good match.

## steps to reproduce:
1. expand the attachment pane (if not already expanded)
2. resize the attachment pane (by moving the horizontal divider upwards)
3. collapse the attachment pane

## expected results:
attachment pane should be collapsed, i.e. only the summary line should be visible (9 attachments, 29.3MB, save all)

## actual results:
See screenshot #2 below.
The attachment pane doesn't collapse, only the files are hidden. So a large empty gray area remains.

## deduping
Maybe a regression? There are [lots of similar bugs](https://bugzilla.mozilla.org/buglist.cgi?classification=Client%20Software&classification=Developer%20Infrastructure&classification=Components&classification=Server%20Software&classification=Other&v1=attachment&v3=%28resiz%7Cexpand%7Ccollaps%29&f1=short_desc&f3=short_desc&v2=pane&f2=short_desc&o3=regexp&o1=regexp&o2=regexp&list_id=16965626&query_format=advanced), but I couldn't find a good match.

## steps to reproduce:
1. expand the attachment pane (if not already expanded)
2. resize the attachment pane (by moving the horizontal divider upwards)
3. collapse the attachment pane

## expected results:
attachment pane should be collapsed, i.e. only the summary line should be visible (9 attachments, 29.3MB, save all)

## actual results:
See screenshot #2 below.
The attachment pane doesn't collapse, only the files are hidden. So a large empty gray area remains.

## deduping
Maybe a regression? There are [lots of similar bugs](https://bugzilla.mozilla.org/buglist.cgi?classification=Client%20Software&classification=Developer%20Infrastructure&classification=Components&classification=Server%20Software&classification=Other&v1=attachment&v3=%28resiz%7Cexpand%7Ccollaps%29&f1=short_desc&f3=short_desc&v2=pane&f2=short_desc&o3=regexp&o1=regexp&o2=regexp&list_id=16965626&query_format=advanced), but I couldn't find a true match.

## steps to reproduce:
1. expand the attachment pane (if not already expanded)
2. resize the attachment pane (by moving the horizontal divider upwards)
3. collapse the attachment pane

## expected results:
attachment pane should be collapsed, i.e. only the summary line should be visible (9 attachments, 29.3MB, save all)

## actual results:
See screenshot #2 below.
The attachment pane doesn't collapse, only the files are hidden. So a large empty gray area remains.

## deduping
There are [lots of similar bugs](https://bugzilla.mozilla.org/buglist.cgi?classification=Client%20Software&classification=Developer%20Infrastructure&classification=Components&classification=Server%20Software&classification=Other&v1=attachment&v3=%28resiz%7Cexpand%7Ccollaps%29&f1=short_desc&f3=short_desc&v2=pane&f2=short_desc&o3=regexp&o1=regexp&o2=regexp&list_id=16965626&query_format=advanced), but I couldn't find a true match.

## steps to reproduce:
1. *expand* the attachment pane (if not already expanded)
2. resize the attachment pane (by moving the horizontal divider upwards)
3. *collapse* the attachment pane

## expected results:
attachment pane should be collapsed, i.e. only the summary line should be visible (9 attachments, 29.3MB, save all)

## actual results:
See screenshot #2 below.
The attachment pane doesn't collapse, only the files are hidden. So a large empty gray area remains.

## deduping
There are [lots of similar bugs](https://bugzilla.mozilla.org/buglist.cgi?classification=Client%20Software&classification=Developer%20Infrastructure&classification=Components&classification=Server%20Software&classification=Other&v1=attachment&v3=%28resiz%7Cexpand%7Ccollaps%29&f1=short_desc&f3=short_desc&v2=pane&f2=short_desc&o3=regexp&o1=regexp&o2=regexp&list_id=16965626&query_format=advanced), but I couldn't find a true match.

## steps to reproduce:
1. expand the attachment pane (if not already expanded)
2. resize the attachment pane (by moving the horizontal divider upwards)
3. collapse the attachment pane

## expected results:
attachment pane should be collapsed, i.e. only the summary line should be visible (9 attachments, 29.3MB, save all)

## actual results:
See screenshot #2 below.
The attachment pane doesn't collapse, only the files are hidden. So a large empty gray area remains.

## deduping
There are [lots of similar bugs](https://bugzilla.mozilla.org/buglist.cgi?classification=Client%20Software&classification=Developer%20Infrastructure&classification=Components&classification=Server%20Software&classification=Other&v1=attachment&v3=%28resiz%7Cexpand%7Ccollaps%29&f1=short_desc&f3=short_desc&v2=pane&f2=short_desc&o3=regexp&o1=regexp&o2=regexp&list_id=16965626&query_format=advanced), but I couldn't find a true match.