1260845 - Touch scrolling with XInput2 broken by addons

Status: RESOLVED INVALID

(Core :: Widget: Gtk, defect)

Description

[Randall Leeds [:tilgovi]]

User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:46.0) Gecko/20100101 Firefox/46.0
Build ID: 20160329113208

Steps to reproduce:

- Install Firefox 46+
- Run with MOZ_USE_XINPUT2=1
- Enjoy touch scrolling on a touch screen laptop
- Install an addon
- Touch scrolling is broken

I have tried three very different addons, and either the ability to scroll with a touch rather than select text suffers from a heisenbug that correlates really inconveniently with my turning addons on and off or something about having addons installed (seemingly any addon) breaks these functionality.


Actual results:

Installing any addon seems to break touch scrolling.


Expected results:

Installing addons should have no affect on touch scrolling.

Comment 1

[Randall Leeds [:tilgovi]]

See #1207700, which appears to track outstanding issues that block enabling XInput2 by default with GTK3.

Comment 2

[Karl Tomlinson (:karlt)]

I wonder whether touch scrolling may depend on e10s, which may be blocked by many add-ons.

Comment 3

[Randall Leeds [:tilgovi]]

I can confirm that at least all the add-ons I tested cause extensions.e10sBlockByAddons to become true, so that's evidence for your idea.

Comment 4

[Randall Leeds [:tilgovi]]

Setting browser.tabs.remote.force-enable demonstrates that you're correct.

In that case, perhaps this is intentional and expected and I leave it to you to close/categorize appropriately.

Thanks for the prompt response.