1643628 - When stepping the highlighted exception appears only after resuming

Status: RESOLVED FIXED

(DevTools :: Debugger, defect, P3)

Description

[Stepan Stava [:stepan]]

https://www.loom.com/share/4901a3b1d1f54691bb5c81a201365950

[Actual result]:

• As shown in the screencast, the exception is highlighted only after resuming.

[Expected result]:

• The exception is highlighted immediately after stepping over the expression that throws the exception.

Comment 1

[Stepan Stava [:stepan]]

Nicolas could this be potentially an issue with the 'resourceWatcher'? If not, we are getting the exception details in why.frameFinished.throw.preview in actions/pause/paused.js so maybe we could just addException from there to handle this case. Thanks.

Comment 2

[Nicolas Chevobbe [:nchevobbe]]

I just checked and this isn't an issue with the resource watcher.
The console service does not emit the message until the debugger is resumed (so you don't get the error in the console until then too).

Maybe this could be something with how step over works? Would you know Jason?

Comment 3

[Jason Laster [:jlast]]

Hmm, interesting. happy to dig into this if you get stuck stepan.

Comment 4

[Stepan Stava [:stepan]]

Attachment: Bug 1643628 - When stepping the highlighted exception appears only after resuming r=davidwalsh

Highlights the exception immediately after stepping over the expression that throws the exception.
Depends on D78883

Comment 5

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

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

For more information, please visit auto_nag documentation.

Comment 6

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

The bug assignee didn't login in Bugzilla in the last 7 months.
:bomsy, could you have a look please?
For more information, please visit auto_nag documentation.

Comment 7

[Hubert Boma Manilla (:bomsy) PTO until Sept 1st]

This looks to be fixed now.

The highlighted exception now always appears (before, during and after stepping).
I confirmed using STR

• Open https://preview-js-test.glitch.me/
• Open debugger
• Goto script2.js
• Set breakpoint on line 2 inside function a()
• Refresh the page
• Step over a couple of times
• Notice exception is highlighted before pause, during stepping and after