QA/Platform/Graphics/Changes/Asynchronous Scrollbar Dragging

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

Full Query

Summary	Status	Resolution
Let nsSliderFrame trigger an async APZ scroll	RESOLVED	FIXED
Add DragInputBlock	RESOLVED	FIXED
Assertion failure: mInputType == SCROLLWHEEL_INPUT (Invalid cast of InputData.)	RESOLVED	FIXED
[APZ Drag] Can't switch active wheel scroll frame without changing focus	RESOLVED	FIXED
[APZ Drag] Scroll position in opposite axis reset to zero when scrolling	RESOLVED	FIXED
Async scrollbars break list box & combo box scrolling	RESOLVED	FIXED
[apz scrollbar] Clicking on scrollbar slider moves it to wrong position	VERIFIED	FIXED
async drag: Can't drag all the way vertically	VERIFIED	FIXED
Can't drag vertical scrollbar past a certain point with APZ drag enabled	RESOLVED	DUPLICATE
Content area occasionally goes blank when dragging scrollbar with APZ drag enabled	RESOLVED	WORKSFORME
async drag: Dragging while the scrollbar's max value changes permanently breaks scrolling	RESOLVED	WORKSFORME
Scrolling using scrollbar thumb on long pages results in heavy checkerboarding	NEW
Wheel scrolling interrupts scrollbar drag scrolling	RESOLVED	WORKSFORME
scrollbar drag handle moves on mousedown when APZ drag is enabled	RESOLVED	DUPLICATE
Enable APZ scrollbar dragging on Nightly	RESOLVED	FIXED
scroll bars not moving or not allowing scrolling on Google Sheets	VERIFIED	FIXED
Google Spreadsheets scrollbar dragging no longer works	VERIFIED	FIXED
APZ scrollbar dragging breaks devtools property list scrolling	VERIFIED	FIXED
Disable scrollbar dragging pref on Android	RESOLVED	FIXED
Write more automated tests for async scrollbar dragging	RESOLVED	FIXED
Fast scrolling up and down by dragging the scrollbar doesn't work properly	RESOLVED	INVALID
APZ: Avoid blocking on the main thread to initiate APZ scrollbar dragging	RESOLVED	FIXED
A black horizontal line appears on the scrollbar when the slider is dragged	RESOLVED	WORKSFORME
Support slider.snapMultiplier with async scrollbar dragging	RESOLVED	FIXED
Scrollbar doesn't follow mouse cursor if scrollable area is partially off-screen	VERIFIED	FIXED
Scrollbar moves in opposite direction by 1px sometimes	RESOLVED	WORKSFORME
Scrolling in <listbox> elements leaves white area that doesn't respond to scrolling	VERIFIED	FIXED
Shift+Click dragging of scrollbar leaves black horizontal lines	RESOLVED	WORKSFORME
[e10s] dragging scrollbar with mouse scroll the page instead of the scrollable div	RESOLVED	DUPLICATE
Scrollbar is not painted fully after mouse leaves and reenters Firefox window	RESOLVED	FIXED
Scrollbar thumb can still be cut off after being offscreen	RESOLVED	FIXED
Scrollbar thumb inside iframe can still be cut off after being offscreen	VERIFIED	FIXED
APZ: Support async scrollbar touch dragging	VERIFIED	FIXED
Scrollbar thumb inside iframe flickers after being offscreen	VERIFIED	FIXED
[RTL] Scrollbar moves in opposite direction with horizontal scrolling	VERIFIED	FIXED
Regression in behaviour of async-scrolling offscreen scrollbar thumb inside iframe	RESOLVED	FIXED
The scrollbar cannot be moved to the top/bottom	RESOLVED	WORKSFORME
Scrollbar thumb inside iframe disappears when click it	RESOLVED	DUPLICATE
[Youtube] Visual glitches are triggered by the scrolling attempt, when the "Share" window is opened	RESOLVED	FIXED

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