1528935 - Make nsIDOMWindowUtils::SendMouseEvent() work in Fission

Status: NEW

(Core :: DOM: UI Events & Focus Handling, enhancement, P3)

Description

[Henri Sivonen (:hsivonen) (not reading bugmail until 2025-02-20)]

https://searchfox.org/mozilla-central/source/dom/webidl/FrameLoader.webidl#70
and
https://searchfox.org/mozilla-central/source/dom/interfaces/base/nsIDOMWindowUtils.idl#268
end up calling TabParent::SendMouseEvent, which dispatches a mouse event without a WidgetEvent object.

Since the current Fission event delivery story is built around WidgetEvent, there's a need to investigate what alternative design is needed for this WidgetEvent-less API.

Comment 1

[Olli Pettay [:smaug][[e-mail]]]

I don't thing FrameLoader.sendCrossProcessMouseEvent is used.

https://searchfox.org/mozilla-central/rev/dc0adc07db3df9431a0876156f50c65d580010cb/dom/base/nsContentUtils.cpp#7938 is also rather important here, since that passes the event to parent.

Comment 2

[Chris Peterson [:cpeterson]]

Tentatively moving all bugs whose summaries mention "Fission" (or other Fission-related keywords) but are not assigned to a Fission Milestone to the "?" triage milestone.

This will generate a lot of bugmail, so you can filter your bugmail for the following UUID and delete them en masse:

0ee3c76a-bc79-4eb2-8d12-05dc0b68e732

Comment 3

[Chris Peterson [:cpeterson]]

Fission Future until until a feature or test that blocks Fission uses this feature.