Summary

Enable asynchronous scrolling when dragging the scrollbar.

Contacts

• Benoit Girard (Dev)
• Anthony Hughes (QA)
• mozilla.dev.platform

Tracking

• Target Milestone: Gecko 48
• Tracking Bug: bug 1211610
• Status: [ON TRACK]

Testing

[need to add description/links to any tests/tasks]

• 'apz.drag.enabled' to true and restart.
• test page: http://people.mozilla.org/~bgirard/scroll_no_paint.html (scrolling on this page is slow in FF because it hits a performance bugs in layer construction code. However with APZ the scrolling is smooth and a bit checkerboard-y instead. If you have 'layers.acceleration.draw-fps' set you should notice the left most FPS counter at 60 FPS while the middle counter will be much lower. This is APZ handling the scroll.)

If you experience scrolling issues, change apz.drag.enabled to false in about:config and retest to confirm the issue is caused by APZ. If confirmed, please file a bug report which blocks bug 1211610.

Bugs

39 Total; 1 Open (2.56%); 27 Resolved (69.23%); 11 Verified (28.21%);