1891970 - Firefox View breakpoint for collapsing the sidebar triggers too late

Status: NEW

(Firefox :: Firefox View, enhancement, P3)

Description

[James Frost]

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:125.0) Gecko/20100101 Firefox/125.0

Steps to reproduce:

Resize the window horizontally while on the Firefox View tab while observing when the breakpoint for going from text labels to just icons on the sidebar.

Actual results:

The breakpoint requires the window to be too narrow, which means that the tab list controls are already cut off by the time it triggers, with a horizontal scrollbar. See attached video.

Expected results:

The breakpoint should trigger when there is no longer room on the page, so the horizontal scrollbar does not appear.

Comment 1

[James Frost]

Attachment: Screencast from 2024-04-17 13-14-32.webm

Reuploaded as previous video was too big.

Comment 2

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'Firefox::Firefox View' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Comment 3

[Kelly Cochrane [:kcochrane]]

Switching this to an enhancement as it was originally requested that we implement it such that a horizontal scrollbar appears when the window is below a certain width. See this comment.

Comment 4

[James Frost]

While I agree with the horizontal scrollbar when the window gets truly narrow, below 780px (as measured with the devtools inspector), the issue is that there is a period from 830px to 950px wide where the wider layout is still used but it goes offscreen. The narrow layout should just be used from 950px
I've attached an image showing this state more clearly.

Comment 5

[James Frost]

Attachment: view.png

Comment 6

[Monica Chiorean]

Marking as new for engineering input. Thank you.