1045755 - APZC turns pan event into tap event when under heavy load

Status: RESOLVED WORKSFORME

(Core :: Panning and Zooming, defect)

Description

[Benoit Girard (:BenWa)]

Attachment: emrun.tar

STR:
0) Enable DevTools from Settings.
1) Extract emrun.tar, $ ./run.sh

This will begin installing 100 apps over the next minute or so. The phone will be under a very heavy load when APZC panning becomes very difficult. Trying to pan on the homescreen often turns pan into touch event which instead opens a app incorrectly.

Comment 1

[Benoit Girard (:BenWa)]

Test on tip. This isn't fixed.

Comment 2

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

Moving the input events off the main thread should help this.

Comment 3

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

I had to remove the "embed-apps" line from the webapp.manifest and update app.zip in order to repro the STR, otherwise I got an error about being unable to install the app.

However, once I got that going I was able to pan up and down on the homescreen without any issues. It was certainly checkerboarding and low-res-painting a lot, which I would expect because the main thread is busy. There was also a noticeable latency between moving my finger and the pan kicking off, which I assume is due to touch event listeners and will be fixed by bug 1130016 and/or bug 1116579. However in no case did a pan turn into a tap, so I'm calling this bug WFM (really it was fixed by 930939 landing).