Fix issue with when a CR/LF split occurs at a SubText's underlying span start #80911
+55
−16
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I hit an exception in the SourceText system when inserting a copilot edit for C# content in a razor file when the file uses newlines only. This ended up causing a CR/LF split in the subtext class, which had some bogus logic for when that happened.
Added a very simple unit test that demonstrated previous failure.