906109 - APZC can get stuck pinching instead of panning

Status: RESOLVED FIXED

(Core :: Graphics: Layers, defect)

Description

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

STR:
1. Load a page in the B2G browser.
2. Put down finger A on the page
3. Put down finger B on the page
4. Slide finger A up off the page and off the screen, leaving finger B on the page
5. Move finger B around

Expected behaviour: the page pans
Actual behaviour: the page zooms

This happens because the GestureEventListener gets a MULTITOUCH_START event with two fingers, never gets a MULTITOUCH_END or MULTITOUCH_LEAVE event, and continues getting MULTITOUCH_MOVE events from finger B. Even thought these events have only one touch point, GestureEventListener still has in its array the touch point from finger A, and so thinks it should be pinching instead of panning.

Comment 1

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

Attachment: Patch

Comment 2

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

Comment on attachment 791375 [details] [diff] [review]
Patch

Actually, not sure if :drs is still around and/or reviewing patches so moving this to Anthony.

Comment 3

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

https://hg.mozilla.org/integration/b2g-inbound/rev/24fbe2665d27

Comment 4

[Ryan VanderMeulen [:RyanVM]]

https://hg.mozilla.org/mozilla-central/rev/24fbe2665d27