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  1. Qt
  2. QTBUG-75393

[REG: 5.12.2->5.12.3]: When using Connections inside QML and a debugger is attached then it will fail at runtime to access named signal arguments

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    • Commits:
      4fea3ec29c9911522a379a01418394b5cad29ecc (qt/qtdeclarative/5.12)

      Description

      When using Connections inside QML and a debugger is attached then it will fail at runtime to access named signal arguments. This only happens if QML debugging is turned on in conjunction with attaching a debugger, every other combination is fine.

      With the example attached, if it is failing then it will output:

      10:55:48: Debugging starts
      2019-04-24 10:55:54.374486+0200 untitled105[51047:4310884] QML debugging is enabled. Only use this in a safe environment.
      2019-04-24 10:55:54.728405+0200 untitled105[51047:4310950] QML Debugger: Waiting for connection on port 63275...
      2019-04-24 10:55:54.927688+0200 untitled105[51047:4310884] qrc:/main.qml:15: ReferenceError: textArg is not defined
      2019-04-24 10:55:55.175851+0200 untitled105[51047:4310945] MessageTracer: Falling back to default whitelist
      10:55:57: Debugging has finished
      

      whereas when it works it will output:

      11:10:02: Debugging starts
      2019-04-24 11:10:08.080371+0200 untitled105[54077:4321504] QML debugging is enabled. Only use this in a safe environment.
      2019-04-24 11:10:08.380209+0200 untitled105[54077:4321565] QML Debugger: Waiting for connection on port 63663...
      2019-04-24 11:10:08.906772+0200 untitled105[54077:4321504] [qml] arg: this is some text
      2019-04-24 11:10:08.906878+0200 untitled105[54077:4321504] [qml] textArg: this is some text
      2019-04-24 11:10:09.147792+0200 untitled105[54077:4321560] MessageTracer: Falling back to default whitelist
      11:10:10: Debugging has finished
      

      This is introduced by change c9e6251cc8dfcf002f64b07e48dd68b7edd3f630 in qtdeclarative (according to a git bisect)

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              Assignee:
              ulherman Ulf Hermann
              Reporter:
              andysh Andy Shaw
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                Created:
                Updated:
                Resolved:

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