1326736 - [e10s] <select>'s drop-down list doesn't preserve scroll position if selected option was visible

Status: UNCONFIRMED

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

Description

[arni2033]

>>>   My Info:   Win7_64, Nightly 50, 32bit, ID 20160726080520 (2016-07-26)
Select in non-e10s and <menulist> elements preserve scrolling if option is visible. If option wasn't
visible, e.g. list was scrolled to beginning/end, then it scrolls respectively to scroll position
(just like tabs toolbar scrolls tab into view when I open new tab by middle-click on link)

Bug 1253975 is actually a part of this; I haven't filed this bug first, because there're TOO MANY BUGS

>>>
STR_1:
1. Open attachment 8727219 [details]
2. Click on dropmarker to open list of options
3. Scroll the list, so that selected option (30) was in the middle of visible part
4. Doubleclick on dropmarker to hide and reopen list of options

AR:  List is scrolled as close as possible to the beginning
ER:  List should preserve scroll position, selected option should be in the middle of visible part


STR_2:
1. Open attachment 8727219 [details]
2. Click on dropmarker to open list of options
3. Scroll the list to the very end, so that selected option (30) was not visible
4. Doubleclick on dropmarker to hide and reopen list of options

AR:  List is scrolled as close as possible to the beginning, and selected option is visible
ER:  List is scrolled as close as possible to the end, and selected option should be visible


STR_3:  (good)
1. Open attachment 8727219 [details]
2. Click on dropmarker to open list of options
3. Scroll the list to the very beginning, so that selected option (30) was not visible
4. Doubleclick on dropmarker to hide and reopen list of options

AR == ER:  List is scrolled as close as possible to the beginning, and selected option is visible

Comment 1

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

[Triage] feature functionality isn't impacted. Consideration of other browsers, we don't see compatibility issues here, so it's a very low priority, P5.