1339795 - [e10s] <select> dropdown list is not displayed when there's nothing in the list

Status: NEW

(Core :: Layout: Form Controls, defect, P5)

Description

[Loic]

Attachment: dropdown-list-missing.png

STR:

1) Enable e10s
2) Open testcase https://bugzilla.mozilla.org/attachment.cgi?id=8837573
3) Switch to RDM

Result: dropdown list is not displayed. It's displayed with e10s disabled.

Comment 1

[J. Ryan Stinnett [:jryans] (Use needinfo, replies may be slow)]

Does it actually depend on RDM at all?  I see the same difference between e10s on vs. e10s off outside of RDM as well.

Comment 2

[Loic]

Indeed, it's more an issue with e10s, no need of RDM.

Comment 3

[yusuhail]

There is nothing in the drop-down list. I'm testing this on 54.0a1 (2017-02-14) and the list is empty on e10s, non-10s, and Safari windows. However, visually the empty list looks different on e10s and non-e10s windows.

Comment 4

[Hsin-Yi Tsai (she/her) [:hsinyi]]

A even more simplified version of test case for comment 0 is: data:text/html,<select></select>

However, as there's nothing in the drop-down list, I personally would think this is a very edge case. Note, chrome behaves the same as what the current e10s behaviour. If there's something in the drop-down list, e.g. adding "option", then drop-down is displayed as expected. Considering the facts, I am going to mark this as P5 (very very low priority, but will accept a patch). 

Astely, feel free to change it if you have different opinions.