1216488 - [APZ] overflow: auto/scroll; would not scroll on scrollber by mouse wheel when apz enabled

Status: RESOLVED FIXED

(Core :: Panning and Zooming, defect)

Description

[Alice0775 White]

Attachment: testcase

Build Identifier:
https://hg.mozilla.org/integration/mozilla-inbound/rev/da38bd42a863a6b3228500912a1bb2766ff79166
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:44.0) Gecko/20100101 Firefox/44.0 ID:20151020024007

Steps To Reproduce:
1. Open attached testcase
2. mouse over scrollbar(not thumb) of Box1 and turn mouse wheel one tick
   --- may work as expected if no scrollbar on root element

3. mouse over scrollbar(not thumb) of Box2 and turn mouse wheel one tick
   --- does not work, BUG!!!

4. mouse over scrollbar(not thumb) of Box3 and turn mouse wheel one tick
   --- does not work, BUG!!!
   

Actual Results:
Not scroll the element.
However, It may work 2nd tick

Expected Results:
these elements should scroll properly

Bug 1190112 and Bug 1213324 did not fix the problem.
It works when disable APZ

Comment 1

[David Anderson [:dvander] - inactive, e-mail if emergency]

Attachment: bug1216488.patch

Silly bug in the patch for bug 1213324 prevented this test case from being fixed too. We can't use NULL_SCROLL_ID to check whether we're building a scrollbar frame since that's used when the scrollframe isn't active.

Comment 2

[Pulsebot]

https://hg.mozilla.org/integration/mozilla-inbound/rev/24653ad483de

Comment 3

[Wes Kocher (:KWierso) (Not reading bugmail; email directly if needed)]

https://hg.mozilla.org/mozilla-central/rev/24653ad483de