1601850 - Add an about:config option to force-enable XInput2

Status: NEW

(Core :: Widget: Gtk, task, P5)

Description

[Botond Ballo [:botond]]

Users currently have to use the environment variable MOZ_USE_XINPUT2=1 to force-enable XInput2 to get touch event support, until XInput2 is enabled by default in bug 1207700.

Some users might find it easier to flip an about:config option than to set an environment variable. I suggest we add one.

Comment 1

[jtjamrog]

Perhaps it be named browser.forcetouch? Just a thought.

Comment 2

[Botond Ballo [:botond]]

Attachment: Bug 1601850 - Add a pref to force-enable XInput2. r=karlt

Comment 3

[Botond Ballo [:botond]]

I named the pref widget.gtk.xinput2.force-enable, to be consistent with our existing pref naming conventions, and describe more specifically what it does.

Comment 4

[Botond Ballo [:botond]]

I discovered during the review that this is not nearly as easy as I thought, because about:config options are stored in the profile, but GTK needs to be initialized before we know what the profile is (because we may need to show a profile selection dialog to choose the profile depending on how Firefox was started).

It's probably still possible to do, but would require a lot of effort (refactoring the initialization logic and such) which does not seem worth it right now. I'm going to mark the bug as a P5 for now.