601258 - Mouse position in popupshowing event is bogus

Status: RESOLVED DUPLICATE of bug 595570

(Core :: XUL, defect)

Description

[Wladimir Palant]

Attachment: Testcase

This issue caused some tooltips in Adblock Plus to break. When I looked into this it turned out that the mouse coordinates (event.clientX/Y, event.screenX/Y) received in popupshowing event of the tooltip are apparently entirely bogus and no longer depend on the actual mouse position. This makes custom tooltips on a tree widget pretty much impossible, without proper position it is not possible to tell which tree cell to show the tooltip for. Note that the default tooltips still work - apparently they take a different route that is only available for binary code.

The attached testcase demonstrates the problem. Download the testcase and open it from a chrome location (alternatively: use Remote XUL Manager to allow bugzilla.mozilla.org to serve remote XUL). Put the mouse somewhere, an alert message will display the screen/client coordinates received in popupshowing event. Now move the mouse somewhere else - note that the coordinates don't change.

Comment 1

[Wladimir Palant]

This regressed between 2010-09-10 and 2010-09-11, regression range: http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=8e0fce7d5b49&tochange=79d0beec27b5

Comment 2

[Alice0775 White]

This may be duplication of Bug 595570