jeffreytan81 wrote:

> If I have a program with lots of threads - particularly if they are running 
> in a small set of work functions - it's very common to have multiple 
> breakpoint hits at the same time. And in this mode I'm going to end up having 
> to scroll down the list - which if I have lots of threads will involve some 
> actually scrolling - every time I stop in order to make sure I'm not missing 
> any breakpoint hits I wanted to look at. I don't think this is a great 
> solution to the UI problem, but since it's a mode you can turn on and off it 
> falls in the you do you category.

Thanks for sharing the thoughts. I see your concern. However, this feature has 
been explicitly asked by our internal customers because, without this feature, 
VSCode is showing multiple yellow lines in VSCode editor while stopping which 
makes it almost unusable for them. (I wish I can show you the screenshot). This 
feature has actually been landed as an internal patch and used by them for a 
while.

I have done some more intensive user study about the experience in Xcode and 
Windows Visual Studio. Xcode always sent all stopped events, but putting the 
focused/current thread with different color (green for focused thread, yellow 
for non-current threads) so it is better than VSCode (which does not show 
different color for current vs background thread's stopped events) so stopped 
line is yellow. Visual Studio never sent multiple stopped events, and only one 
public stop is sent. I am not sure if it is ensured by Windows kernel or 
debugger itself.

Ideally, we would like the combination of both world -- default showing one 
stopped event, but providing a UI hint to toggle into Xcode experience by 
showing all stopped threads in editor. And we also talk about extend VSCode UI 
to ad an option "only show threads with stop reasons". 

This is just first step to reduce the major concern for our customers.


https://github.com/llvm/llvm-project/pull/98568
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