1589090 - The strings from the left part of the new "about:welcome" modal less page variants are wrongly cut if the browser is horizontally resized below 40%

Status: VERIFIED FIXED

(Firefox :: Messaging System, defect, P1)

Description

[Marius Coman [:mcoman], Ecosystem QA]

Attachment: rec of the issue.gif

[Affected versions]:

• Firefox Nightly 71.0a1 - Build ID: 20191015213743

[Affected Platforms]:

• All Windows
• All Linux
• All Mac

[Prerequisites]:

• Have a new Firefox profile with the "trailhead.firstrun.branches" pref set to "full_page_d-supercharge" in the "about:config" page.

[Steps to reproduce]:

1. Open the browser with the profile from prerequisites.
2. Navigate to "about:welcome" page and resize the browser horizontally to ~40%.
3. Observe the behavior.

[Expected result]:

• The page is resized and all the elements are rearranged in order to fit the available width.

[Actual result]:

• The strings placed in the left part of the page are partially visible.

[Additional Notes]:

• This issue is reproducible on both "modal less" variants.
• Attached a screen recording of the issue.

Comment 1

[GitHub Bugzilla PR Linker]

Attachment: Link to GitHub pull-request: https://github.com/mozilla/activity-stream/pull/5358

Comment 2

[Ed Lee :Mardak]

https://hg.mozilla.org/mozilla-central/rev/39f853367dca

Comment 3

[Marius Coman [:mcoman], Ecosystem QA]

I have verified that this issue is no longer reproducible with the latest Firefox Nightly (72.0a1 Build ID - 20191021215155) installed, on Windows 10 x64, Arch Linux and Mac 10.14.5. Now, the strings from the left part of the new "about:welcome" modal less page variants are fully visible if the browser is horizontally resized below 40%.