1605057 - Duplicate entries in debugger "sources" tree view

Status: UNCONFIRMED

(DevTools :: Debugger, defect, P5)

Description

[Carsten Milkau]

Attachment: 201912191210.png

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:71.0) Gecko/20100101 Firefox/71.0

Steps to reproduce:

1. Go to https://sapui5.hana.ondemand.com/#/entity/sap.m.PlanningCalendar/sample/sap.m.sample.PlanningCalendarViews
2. Open Developer Tools > Debugger

Actual results:

Tree view listing sources contains many duplicate entries. Clicking one expands another, and generally interacting with the tree view produces more and more duplicates.

Expected results:

%

Comment 1

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

Bugbug thinks this bug should belong to this component, but please revert this change in case of error.

Comment 2

[Jason Laster [:jlast]]

Thanks Carsten for reporting, I tested this on Firefox Nightly and it looked fine. Could you try it on Nightly as well?

Comment 3

[Jason Laster [:jlast]]

Attachment: Screen Shot 2019-12-19 at 10.02.38 AM.png

Comment 4

[Carsten Milkau]

Thanks Jason for the reminder. I'm sorry I forgot about the nightly build. However: just for fun I tried again with 71.0 at home, but couldn't reproduce the issue at all. It was perfectly reproducible with 71.0 at work, so I guess I have to dig deeper into that installation when I get back to it (Jan 2). I don't think addons could be triggering this behavior, or could they?

Comment 5

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

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

For more information, please visit auto_nag documentation.

Comment 6

[Jason Laster [:jlast]]

sounds good

Comment 7

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

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

For more information, please visit auto_nag documentation.

Comment 8

[Jason Laster [:jlast]]

I'm not sure how to prioritize it if it has not been reproduced yet.

Comment 9

[Carsten Milkau]

I need to delay that investigation (see comment #4) a little as I am currently on sick leave.

Comment 10

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

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

For more information, please visit auto_nag documentation.

Comment 11

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

I am marking a P5 and keeping status as UNCONFIRMED.

Carsten, thanks for the help with trying to find reproducible test case.

If we can't repro this again, we should close the report.

Honza

Comment 12

[Carsten Milkau]

Sorry guys, an extended sickness prevented me from sending an earlier response.

I managed to reproduce this in 71.0.2 (build 20200107212822) with a pristine profile after installing one addon (but not in safe mode). The addon was my first suspect because it injects CSS. You probably know it:

https://addons.mozilla.org/de/firefox/addon/stylish/

I still think this is a bug in Firefox / Developer Tools rather than Stylish, please tell me if you think I should report it there instead.

I also hardened the steps to reproduce:

open the Developer tools

switch to debugger view

open https://sapui5.hana.ondemand.com/

Actual results:
A new webpage will be loaded. The bug will persist as long as the debugger remains open. You can reload the page, navigate back, the tree remains messed-up. Close the debugger, all fixed.

Expected results:
A new webpage will be loaded. Note that some additional nodes in the tree from Stylish may be expected, but they shouldn't cause the repeated self-duplication explained in the OP.

Comment 13

[Carsten Milkau]

Attachment: Support Information (pristine profile + Stylish)

Comment 14

[Carsten Milkau]

That was supposed to read "reproduce this in 72.0.1", not "71.0.2", sorry. Also please excuse the messed-up formatting, I accidently used the wrong markup language.

Changing this to branch 72.

Comment 15

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

Attachment: Encountered two children with the same key

Thanks for the update Carsten!

I couldn't see duplicates entries in the source tree, but I experienced a warning in the Browser Console.
It's related to duplicates entries, which seems related to the bug report.