1400279 - Popup has horizontal overflow even though it is not at maximum width

Status: NEW

(WebExtensions :: Frontend, defect, P3)

Description

[Martin Giger [:freaktechnik]]

Attachment: overflow-test.zip

The attached test extension has a horizontal overflow scroll bar, even though the content isn't wider than the allowed maximum width (in fact it is 205px wide).

I think the horizontal overflow is caused by the vertical scroll bar, for which the content is not resized to accommodate it.

I've tested this on today's Linux nightly (2017-09-15).

Comment 1

[Nazım Can Altınova [:canova][:canaltinova on phabricator]]

We had the same problem on the Gecko Profiler add-on(https://github.com/devtools-html/Gecko-Profiler-Addon/pull/125#pullrequestreview-162451180). We tried to give `width: 400px` to `body` element. It was working fine on macOS since the Firefox on macOS has floating scrollbar, but on operating systems that don't have floating scrollbar like Linux, there was a horizontal scrollbar since vertical scrollbar was taking the ~17px space from the body element.