1640139 - `contextmenu` events triggered from Control + left-mouse-button report different `button` value than other browsers on Mac

Status: RESOLVED FIXED

(Core :: DOM: UI Events & Focus Handling, defect, P2)

Description

[Edgar Chen [:edgar]]

+++ This bug was initially created as a follow-up of Bug #1638872 comment #9 +++

This is a similar issue as bug 1615732.
In Mac, control + mouse-left-click will trigger contextmenu event, so do other browsers. But we dispatch contextmenu event with different a button value with other browsers.

STR

1. Load https://codepen.io/edgarchen-the-decoder/pen/ExVGRxB
2. control + mouse-left-click on green area.
3. Check the log for contextmenu event

Actual Result

Got contextmenu, button:2, buttons:1, ctrlKey:true
where all other browsers (Chrome, Safari, Edge, Opera) is contextmenu, button:0, buttons:1, ctrlKey:true

Expected Result

Should align with other browsers.

Comment 1

[Edgar Chen [:edgar]]

Attachment: Bug 1640139 - Don't dispatch contextmenu event triggered from control-left-click as right-button in Mac;

All other browsers dispatch contextmenu as left-button in this case.

Comment 2

[Edgar Chen [:edgar]]

https://treeherder.mozilla.org/#/jobs?repo=try&revision=c23769a686245cd969ec28dc56e41eee85b168c4

Comment 3

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/a2c008495f22
Don't dispatch contextmenu event triggered from control-left-click as right-button in Mac; r=masayuki

Comment 4

[Cosmin Sabou [:CosminS]]

https://hg.mozilla.org/mozilla-central/rev/a2c008495f22