Affected versions

• 73.0b8, 74.0a1 (2020-01-21)

Affected platforms

• Windows 10, macOS 10.13, Ubuntu 18.04;

Steps to reproduce

1. Navigate to this link https://getpocket.cdn.mozilla.net/explore/trending?src=ff_new_tab and open ~25-30 different pages each in a new tab, in order to populate the Highlights section.
2. Restart the browser.
3. Click the "..." button for one of the Highlights on the last tile from a row.

Expected result

• context menu is opened on the left side;

Actual result

• context menu is opened on the right side, forcing the scrollbar to appear;

Regression range

• last good build_date: 2019-12-18;
• first bad build_date: 2019-12-19;
• pushlog URL

Additional notes

• 72.0.2 not affected;
• issue surfaced before as bug 1485633;
• best way to reproduce this is resizing the window to ~ half width of the screen.

Can you please provide a regression range when you have a chance?

Managed to find it, updating the summary of the initial report with the result.
Fwiw, it appears to manifest from the point where the div(s) for the highlight card became resized with width decreased(old AS behavior).

After a discussion with :mcoman, we think this might be the same underlying issue as in bug 1607185.
Since bug 1601756 only makes the changes visible to the rest of the world.

So, in regards to this; the same pushlog as per comment 4 in bug 1607185 might be more accurate.

The priority flag is not set for this bug.
:thecount, could you have a look please?

For more information, please visit auto_nag documentation.

This looks like a duplicate of Bug 1607185. Please reopen if it's not. Thanks!