change content in locals & watchers broken during js debug

1. Open qtdeclarative/examples/quick/demos/samegame/samegame.qmlproject from Qt5's repository.
2. Place a breakpoint at the first line of the startNewGame() function (samegame.js) which contains executable code (i.e. not (only) a comment).
3. Start debugging app
4. Enter cleanUp function , try to add expression evaluation i == 10
5. Try to change value ( type 10 -> shows "cleanUp" in value field)
6. Run debug content in expression evaluation not visible.

Please note debug console works correctly.