Document excerpt for Razor, and fix Find All Refs #81291
Merged
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Part of https://devdiv.visualstudio.com/DevDiv/_workitems/edit/2633418
We had to revert some code that made FAR, Hover, Go To Def etc. work in Razor files because to support it we had to add
#linemappings for things, and that broke Hot Reload by changing PDB offsets. Who knrew!This PR enables us to bring back that support without
#linedirectives by allowing locations in Razor source genned documents to be found by FAR even if they're hidden. It also tweaks the LSP source mapping code to drop results that can't be mapped, which actually matches was the VS side already did anyway. Finally it exposes a hook for Razor to implement a document excerpt service, which is something I punted previously because the results with the#linedirectives were good enough, but now they're really not.Commit-at-a-time review is probably simpler, to make it clear which change is for which purpose.