401543 - using full page zoom on an inner iframe can render its contents outside of the frame

Status: NEW

(Core :: Layout, defect)

Description

[Dave Townsend [:mossop]]

Attachment: testcase

The attached testcase is an xul page containing an inner iframe. On load it adjusts the pagezoom to 0.66666. When this happens the content in the iframe shrinks but oddly a larger version of it is also rendered outside the iframe.

I find that the pagezoom is lost on switching to a different tab and back again, though this may be due to how firefox has pagezoom remembering set up.

The testcase requests privileges so should be saved locally before running.

Comment 1

[Dave Townsend [:mossop]]

Attachment: inner frame

For reference this is the source of the inner frame in the testcase

Comment 2

[Robert O'Callahan (:roc) (email my personal email if necessary)]

Ugh, I think I know why this is happening. We merrily build a display list that contains items from the outer frame and the inner frame, and that doesn't work because they don't have the same coordinate systems.

I'm going to need to create a new display list wrapper item that wraps subframes and can handle the change in units.

Not sure if this should block 1.9 though.

Comment 3

[Dave Townsend [:mossop]]

One additional thing I saw at one point was the frame including contents at the bottom that were really from below it in the outer window which sounds like the same sort of thing.

I imagine this case is going to be pretty rare though, I can't seem to get a similar thing happening with content appearing outside the main browser.

Comment 4

[Martijn Wargers (dead)]

Is this still an issue? I don't think I see anything wrong with the testcase.

Comment 5

[Martijn Wargers (dead)]

Or maybe Mac only?

Comment 6

[Dave Townsend [:mossop]]

Still a problem here, make sure you are saving the testcase to a local file or otherwise allowing the privilege escalation.

Comment 7

[Martijn Wargers (dead)]

Oh sorry, I misunderstood the testcase.