850409 - Arrow panel width doesn't take into account overflow CSS property of children

Status: NEW

(Core :: XUL, defect)

Description

[Mike Conley (:mconley) (:⚙️)]

STR:

1) Take content X with fixed height and width, and put it inside a smaller container Y with overflow set to hidden
2) Put all of that within an arrow panel

What happens?

The panel's width accomodates to the larger element X. Screenshot coming.

Comment 1

[Mike Conley (:mconley) (:⚙️)]

Attachment: Screenshot of problem

Larger item has background set to red. Arrow panel is showing the outline.

Comment 2

[Mike Conley (:mconley) (:⚙️)]

Attachment: Chrome Mochitest

Here's the failing test I wrote.

Comment 3

[Mike Conley (:mconley) (:⚙️)]

Hey Neil,

I need to fix this to make the Australis menu panel work to spec. Any idea where I'd start looking in order to fix this?

-Mike

Comment 4

[Mike Conley (:mconley) (:⚙️)]

It turns out that I can hide the sliding elements that are in the Australis panel with the translateX property.

This is no longer blocking me, and the urgency is altogether reduced.