1588363 - Timings column is not visible for developer tools with width of 700px or smaller

Status: NEW

(DevTools :: Netmonitor, defect, P3)

Description

[SL]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:69.0) Gecko/20100101 Firefox/69.0

Steps to reproduce:

1. Open the developer tools and dock it to the left/right. Ensure that the width of the developer tools is 700px or smaller ("devtools.toolbox.sidebar.width" in about:config).
2. Go to an example site and switch to the network monitor tool. The timings column is not visible, even if the context menu shows that it's enabled.
3. Go to about:config and change "devtools.toolbox.sidebar.width" to a figure greater than 700 (e.g. 701). The timings tab suddenly appears.

Actual results:

The timings column is not visible, despite it being selected in the context menu. Even if you disable other columns to try to make space for it, it remains hidden. Only when the width of the developer tools exceeds 700px (e.g. 701px) does it suddenly appear.

Expected results:

The timings column should always be visible, even if there isn't much space for it. Just like you can keep on adding other columns (e.g. set-cookies, URL) when it is crammed, the behavior of the timings column should match the other columns - always be visible, not suddenly disappear when the width is smaller than a hard-coded value.

Comment 1

[SL]

Attachment: Network monitor with a width of 700px.png

Comment 2

[SL]

Attachment: Network monitor with a width of 701px.png

Comment 3

[Jan Honza Odvarko [:Honza] (always need-info? me)]

Thanks for the report!

This is a feature not a bug. The Timeline column (aka Waterfall) doesn't work well if there is not enough horizontal space.

But the following should be fixed/improved:

1. When the Timeline is the last column it shouldn't be hidden when the available horizontall is small
2. Width of the Timeline columns is getting smaller and smaller as it hides and re-appers.
3. The logic calculating the available space could be smarter. Taking in account the number of displayed columns

Honza