1088196 - Bogus JS 'resize' events are fired when transitioning a canvas between fullscreen modes.

Status: NEW

(Core :: DOM: Core & HTML, defect, P5)

Description

[Jukka Jylänki]

STR:

1. Visit https://dl.dropboxusercontent.com/u/40949268/emcc/bugs/bogus_resize_event.html
2. Click the button "Fullscreen bare" on the page.
3. Press esc to transition back to Windowed mode.
4. Open the web console and observe the results:

Observed: The web console prints something like in this image: https://dl.dropboxusercontent.com/u/40949268/emcc/bugs/bogus_resize_event_firefox.png

Note that there are two 'resize' events received for a unexplainable 1936x1056 size, and when transitioning back to windowed mode, the resize event for 300x300 is triggered twice.

The test in the page was conducted on a dualmonitor setup where the main monitor is of size 1920x1080, and a secondary monitor with size 1440x900, although suspecting that this does not matter.

Expected: The log should read

"TO FS: CSS size: 300x300, RTT Size: 300x300" bogus_resize_event.html:78
"RESIZED! New CSS size: 1920x1080, RTT Size: 300x300" bogus_resize_event.html:91
"RESIZED! New CSS size: 300x300, RTT Size: 300x300"

without extraneous resize events.

Not sure if I reported this to the proper Component, so please correct me if I got this wrong.

Comment 1

[Boris Zbarsky [:bzbarsky]]

I expect that issue is that as we transition to fullscreen we do resize events in the usual way, which happens to be partway through the transition...

Comment 2

[Firefox Bug Husbandry Bot]

https://bugzilla.mozilla.org/show_bug.cgi?id=1472046

Move all DOM bugs that haven’t been updated in more than 3 years and has no one currently assigned to P5.

If you have questions, please contact :mdaly.