1609534 - When the address manager subdialog is scrollable, it overlaps the scrollbar for the <select> element

Status: NEW

(Firefox :: Settings UI, defect, P3)

Description

[Robin Steuber (she/her) [:bytesized]]

Attachment: Address manager overlapping scrollbars.png

STR:

1. Navigate to "about:preferences"
2. Search for "addresses"
3. Click the button that reads "Saved Addresses..."
4. Add addresses so that there are at least 8 total.
5. Observe that there is now a scroll bar on the <select> element that displays the addresses.
6. Close the address manager subdialog.
7. Resize the Firefox window so that it is quite small
8. Click "Saved Addresses..." again

Expected Results:
Both the scrollbar for the dialog and the scrollbar for the <select> element should be visible
Actual Results:
The scrollbar for the <select> element is not visible because it is hidden under the scrollbar for the dialog. There isn't even a horizontal scrollbar we could use to bring it into frame.

A couple of notes about this:

• I discovered this while fixing Bug 1608246, which was preventing the subdialog from being shown at all when the Firefox window was too small. You may need to wait for that patch to merge to be able to reproduce this. I did, however, double check with a build from before Bug 1608246 was introduced to verify that this bug was preexisting behavior rather than something I caused.
• I discovered this on Windows. I know that macOS scrollbars are, by default, a bit unusual and like to hide, so I have no idea whether this issue appears there or how it presents.