Bug 11342 - Debugger often loses local variable contents
Summary: Debugger often loses local variable contents
Alias: None
Product: Xamarin Studio
Classification: Desktop
Component: Debugger ()
Version: 4.0.2
Hardware: PC Mac OS
: Normal normal
Target Milestone: ---
Assignee: Jeffrey Stedfast
Depends on:
Reported: 2013-03-21 20:06 UTC by Jake Simpson
Modified: 2013-04-04 14:08 UTC (History)
1 user (show)

Is this bug a regression?: ---
Last known good build:

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Description Jake Simpson 2013-03-21 20:06:48 UTC
Many times, when debugging a large app in the IOS simulator, the locals window fails to populate.

Generally it starts up populated but then there is some 'event' (and I've no idea what it is) where, after stopping, rebuilding and re-running, the locals windows just remains empty. At this point the only thing I can do is use the Watch Window (which still does works) to get variable assignations.

This is a biggie and happens to me pretty much every development session.
Comment 1 Jeffrey Stedfast 2013-03-26 14:51:24 UTC
The only way it seems this can happen is if you don't have debugging symbols in your build
Comment 2 Jake Simpson 2013-03-26 16:29:37 UTC
That might be true, but its still happening.

It happens indeterminately with me. And it still happens with 4.0.3.
All I can think of is that something in the build process might be turning off the generation of debugging symbols.
Comment 3 Jeffrey Stedfast 2013-03-26 16:39:06 UTC
Next time it happens, can you attach the ~/Library/Logs/XamarinStudio-4.0/Ide.log file? Perhaps we'll get lucky and an exception is getting logged that might account for the Locals Window breaking for some reason other than missing debug symbols (which I don't think would be logged)
Comment 4 Jake Simpson 2013-04-04 10:28:49 UTC
More info!

So this is still happening, and it makes debugging very hard.

However, I did see something that might explain what is going on. I _think_ that the window is being resized physically, but not resized logically.

By that, I mean that I was working yesterday and I saw that most of the local variables were being scrolled off the top of the window - I could just make out the bottom of the text of some of the local variables.

I wonder if this is the problem?
Comment 5 Jeffrey Stedfast 2013-04-04 10:51:06 UTC
That could be it. I remember Michael Hutchinson showing me a similar problem in one of the other list views about a year ago.

Do you have a lot of local variables? Are you scrolled down when you stop the debugger (i.e. not at the top). I am wondering if maybe when the list gets cleared, it stays "scrolled" down.

I'll try playing with this idea to see if I can reproduce now that I have some ideas to work with.
Comment 6 Jeffrey Stedfast 2013-04-04 13:09:25 UTC
fixed in git master
Comment 7 Jake Simpson 2013-04-04 14:08:26 UTC