Support #line directive in find references

[filipw]

Fixes #1649
If the mapping goes to an external file, we assume column 0,0

[filipw]

@mholo65 Cake tests fail with this, should I exclude Cake from this span mapping logic?

[bjorkstromm]

@filipw let me have a look at the Cake, and see if I can fix it. Cake, behind the scenes uses a lot of #line mappings, as we basically merge all #loaded files + DSL into one giant csx with custom host which we pass to Roslyn.

[filipw]

@filipw let me have a look at the Cake, and see if I can fix it. Cake, behind the scenes uses a lot of #line mappings, as we basically merge all #loaded files + DSL into one giant csx with custom host which we pass to Roslyn.

did you get a chance to look at this?

[bjorkstromm]

@filipw let me have a look at the Cake, and see if I can fix it. Cake, behind the scenes uses a lot of #line mappings, as we basically merge all #loaded files + DSL into one giant csx with custom host which we pass to Roslyn.

did you get a chance to look at this?

I'm looking now.

[filipw]

thanks @mholo65

should be good to go