1538971 - Breakpoints in prettified code can disappear

Status: RESOLVED FIXED

(DevTools :: Debugger, defect, P2)

Description

[:Harald Kirschner :digitarald]

What were you doing?

1. Open Debugger on https://www.youtube.com/watch?v=wy4OCcAvIUs
2. Open /yts/jsbin/desktop_polymer-vflsaNyYs/desktop_polymer.js
3. Set a breakpoint (I searched for .hidden = !0)
4. Refresh (a few times, if needed)

Recording: https://www.dropbox.com/s/it814xp6bzcazh7/debugger-youtube-prettify-reload.mp4?dl=0

What happened?

Never: Pauses correctly
Sometimes: Breakpoints disappear
Once: BPs disappear and the prettified file gets stuck with undefined content

What should have happened?

Pausing on reload and remembers breakpoints.

Chrome pauses correctly on the line.

Anything else we should know?

Browser Console error shows a few failing source map requests but also this:

SyntaxError: Unterminated string constant (48514:0) parser-worker.js:6938:13
    parse resource://devtools/client/debugger/new/dist/parser-worker.js:6938
    getAst resource://devtools/client/debugger/new/dist/parser-worker.js:7017
    traverseAst resource://devtools/client/debugger/new/dist/parser-worker.js:7035
    extractSymbols resource://devtools/client/debugger/new/dist/parser-worker.js:11586
    getSymbols resource://devtools/client/debugger/new/dist/parser-worker.js:11767
    workerHandler resource://devtools/client/debugger/new/dist/parser-worker.js:5025
    workerHandler resource://devtools/client/debugger/new/dist/parser-worker.js:5023

Comment 1

[David Walsh :davidwalsh]

I couldn't reproduce this. The pretty-printed tab displays (albeit after a while because this is a huge file) and the breakpoint reliably displays each reload.