Add view of the codeflow message inline in the editor about sarif-vscode-extension

[dgmelski]

Is below the line an option? I think that's what CodeSonar and Clang Static Analyzer do.

Either above or below may sometimes split a multi-line statement. I'm not sure what existing tools do in that case. It might be an argument for "to the right."

Which messages are shown inline could be tied to the "level of detail" option. Arguably should be. (You could have two separate "level of detail" sliders, but that seems a mess.)

In the code view, I'd like the level of detail to control whether messages are displayed or not, but I think involved lines should always be highlighted, regardless of the level of detail.

[michaelcfanning]

I believe most viewers puts this information below the line. @rscrivens, VS code lens can provide another data point as far as current viewer behavior.

I tend to agree we could consider two exclusive modes, either the discrete code flow navigator or the inlined view. We definitely should have a single detalis widget that applies to either experience.

We will retain path highlighting for verbose message inlined in code, but the events chrome and other widgets/etc. would disappear. Chrome/etc. for messages hidden due to detail level could still be available on hover.

[rscrivens]

After investigating/prototyping, the options for below the region either have issues or aren't supported yet:

• Codelens Below: only seem to display above the region it's associated with, so to get it below I assign the code lens to the line after the end of the region. But this can cause indentation issues if the next line is indented differently then the region the message is for:
  

• View zone widget: VSCode has a widget which looks like it might work well for what we need but I couldn't find anywhere it's currently exposed for extensions to use. This is it inuse to toggle through errors(F8 key)
  
  There are a few requests for a custom inline widget for extensions to use such as microsoft/vscode#3220.

For now the best option I can see is using codelens showing the message above region, here's an example of that (includes the functionality to hide/show the message based on verbosity setting):