1369675 - Closing sidebar flickers the page when the sidebar is on the left

Status: RESOLVED DUPLICATE of bug 1117253

(Firefox :: General, defect)

Description

[Michal Stanke (Mozilla.cz) [:mstanke][:MikkCZ]]

Mozilla/5.0 (X11; Linux x86_64; rv:55.0) Gecko/20100101 Firefox/55.0 ID:20170601100220 CSet: bdb2387396b4a74dfefb7c983733eed3625e906a

When the sidebar is on the left, closing it (e.g. Ctrl+B) flickers the site. Looking closely I noticed the sidebar actually moves to the right side for a supershort moment and than closes.

Also rerendering the side, when the sidebar is opened looks much worse than when it's on the right. Just give it a try in this bug.

When the sidebar is on the right, there is no visible issue.

STR:
1) Have sidebar set to open on the right.
2) Ctrl+B to open it.
3) Ctrl+B to close it.
4) The page is narrowed/widen instantly without any flickering or blinks.
5) Set the sidebar on the left.
6) Repeat 2) and 3).
7) Notice, that when opening the the sidebar the page jump somehow. When closing the sidebar, white area appears on the right side of the page.

Comment 1

[Michal Stanke (Mozilla.cz) [:mstanke][:MikkCZ]]

Attachment: video

Here I have made a video of the issue. It's not visible for the first time I opened/closed the sidebar on the video, but on the second time it is.

Comment 2

[Alice0775 White]

This seems to be duplication of Bug 1117253

Comment 3

[Michal Stanke (Mozilla.cz) [:mstanke][:MikkCZ]]

You are right. I cannot reproduce when I open a new non-e10s window.