1245523 - Blink of wrong scroll position when hiding or showing dynamic toolbar

Status: RESOLVED INCOMPLETE

(Firefox for Android Graveyard :: Toolbar, defect, P5)

Description

[Chris Lord [:cwiiis]]

STR:

1. Navigate to a page long enough to scroll vertically and hide the dynamic toolbar.
2. Scroll down to hide the toolbar
3. Scroll up enough to show a little over half of the toolbar

Expected:

Toolbar animates into position

Actual:

Toolbar animates into position, but page flashes briefly with the wrong scroll position.

I've observed this on a 10.1" Samsung Galaxy Tab 3 and a Tesco Hudl 2 tablet. These are both Intel-chip tablets (though different generations). The Samsung tablet is running Android Kitkat with lots of awful Samsung customisations and the Hudl2 is running a mostly-stock Android Lollipop.

Comment 1

[Michael Comella (:mcomella) [NI reported issues only: ex-Mozilla]]

kats, is there an ETA on this bug? The proper fix for bug 1245493 depends on it.

Comment 2

[Kartikaya Gupta (email:[e-mail])]

At the moment there is no ETA. The plan here is to converge with other browser vendors on a standard behaviour [1] for the browser when the toolbar is shown/hidden. Right now we fire resize events to content and change the scroll position and such; if we can avoid doing some of that work this bug will probably go away or be easier to fix.

[1] WIP at https://github.com/bokand/URLBarSizing/

Comment 3

[Firefox Bug Husbandry Bot]

Re-triaging per https://bugzilla.mozilla.org/show_bug.cgi?id=1473195

Needinfo :susheel if you think this bug should be re-triaged.

Comment 4

[BMO Automation]

We have completed our launch of our new Firefox on Android. The development of the new versions use GitHub for issue tracking. If the bug report still reproduces in a current version of [Firefox on Android nightly](https://play.google.com/store/apps/details?id=org.mozilla.fenix) an issue can be reported at the [Fenix GitHub project](https://github.com/mozilla-mobile/fenix/). If you want to discuss your report please use [Mozilla's chat](https://wiki.mozilla.org/Matrix#Connect_to_Matrix) server https://chat.mozilla.org and join the [#fenix](https://chat.mozilla.org/#/room/#fenix:mozilla.org) channel.