Debugger line highlighter not updating when number of lines in file being debugged changes

[BenSandeen]

• VSCode Version: Code 1.7.2 (7ba55c5860b152d999dda59393ca3ebeb1b5c85f, 2016-11-21T22:14:18.217Z)
• OS Version: Linux x64 4.4.0-53-generic
• Extensions:

Extension	Author	Version
rainbow-brackets	2gua	0.0.6
output-colorizer	IBM	0.0.8
indenticator	SirTori	0.2.1
code-gnu-global	austin	0.2.1
codecover	bradleymeck	1.1.0
python	donjayamanne	0.5.5
code-runner	formulahendry	0.6.3
cs-syntax-visualizer	itn3000	0.0.2
Hg	jake-coltman	0.0.4
clangcomplete	kube	0.0.5
vscode-clang	mitaki28	0.2.1
cpptools	ms-vscode	0.9.3
csharp	ms-vscode	1.5.3
sublime-keybindings	ms-vscode	1.8.0
indent-rainbow	oderwat	0.4.1
vscode-icons	robertohuertasm	4.1.0
trailing-spaces	shardulm94	0.2.11
shader	slevesque	0.2.2
cmake	twxs	0.0.15
cmake-tools	vector-of-bool	0.8.6
clang-format	xaver	1.0.0

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Steps to Reproduce:

1. Run debugger (I'm currently using python, but I think this is language agnostic)
2. Edit the file you're debugging to change the number of lines above the line the debugger is on (I used another text editor, but I think I've seen this occur if I edit the file using VSCode)
3. Now the debugging line indicator should be displaced from the actual line that is being debugged by a number of lines equal to the number of lines inserted

[weinand]

The VS Code debugger ('node') does not yet support 'live edit'. This means that whenever you edit source while a debug session is active, the debugger is not aware of the source change and line and column locations are not displayed correctly. To make the user aware of this we show breakpoints in grey after a source edit.

@isidorn currently the yellow current line is adjusted after lines are inserted or deleted. This is confusing because the user thinks that the debugger has picked up the changes (which it didn't). And another 'step' makes the current line jump back to the original location. I suggest that we do not adjust the current line when the editor is dirty.

@roblourens I noticed that 'node2' shows some erratic behaviour when inserting lines while a debug session is active. Are you already trying to support 'live edit'?

[isidorn]

@weinand the yellow current line is implemented using editor decorations and this is just how editor decorations work - namely they are tied to the location in the edior and as that location changes the decorations automatically update. Also not adjusting a current line would have the downside of making it confuzing for adapters that do support live editor.

Closing as will not fix

[weinand]

@isidorn if the current implementation does not work for us, then we will have to fix this on our end.

If we start supporting live editing, then we will have to address your second argument.

[roblourens]

No, I'm not doing anything to support live edit.

[roblourens]

node2 doesn't look any more erratic than node-debug to me. It's what I expect, if I insert a line, then the highlight is off by a line.

[isidorn]

I still have no immediate plans of fixing this. @weinand leaving up to you to close if you want

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