1358975 - [e10s] The option checked for <select> disappears when opened for the first time

Status: NEW

(Core :: Layout: Form Controls, defect, P3)

Description

[blinky]

Steps to reproduce:

1. Go to https://onedrive.live.com/download?cid=F96BA52A2AF70D03&resid=F96BA52A2AF70D03%211362&authkey=ACzTTnL6f5-eFoI.
2. Open the <select> element.


Actual results:

The option checked for <select> disappears and shows when opened for the first time.

Comment 1

[blinky]

Regression range:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=b35e46dc0604&tochange=cf051de0d37b

Regressed by: bug 1352963

Comment 2

[Jared Wein [:jaws] (please needinfo? me)]

This is happening because we recreate all of the DOM nodes on transitionend during update. Instead of just deleting everything, we could compare what was previously used to create the menu with what was determined via the transitionend, and if it's not any different we can bail out of the update without replacing all of the nodes.

Comment 3

[Jared Wein [:jaws] (please needinfo? me)]

Attachment: Bug 1358975 - Test to confirm that nodes shouldn't change on transitionend if value and label are unchanged.

Review commit: https://reviewboard.mozilla.org/r/133060/diff/#index_header
See other reviews: https://reviewboard.mozilla.org/r/133060/

Comment 4

[Jared Wein [:jaws] (please needinfo? me)]

I have attached a test that will fail if the nodes are removed, but I don't have time right now to implement the code that only updates what has changed.

Comment 5

[Mike Taylor [:miketaylr]]

Does it still reproduce? Seems OK here.

Comment 6

[blinky]

I can reproduce this bug with the latest nightly build.

Comment 7

[blinky]

This happens here too https://onedrive.live.com/download?cid=F96BA52A2AF70D03&resid=F96BA52A2AF70D03%211470&authkey=AKCu41R_qsD3Flo.

Comment 8

[Panos Astithas (he/him) [:past] (please ni?)]

Does this still happen for 57?

Comment 9

[blinky]

I can still reproduce this bug in https://onedrive.live.com/download?cid=F96BA52A2AF70D03&resid=F96BA52A2AF70D03%211480&authkey=AMq45IS6QuDeKhQ.

Comment 10

[Sylvestre Ledru [:Sylvestre]]

Moving to p3 because no activity for at least 1 year(s).
See https://github.com/mozilla/bug-handling/blob/master/policy/triage-bugzilla.md#how-do-you-triage for more information