Handle completions with trailing whitespace on previous lines #2319
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LSP filters expect that the range of the main text edit is going to start on the same line as the cursor. However, when trailing whitespace preceeds the override marker, Roslyn will return a single text edit for the whole range that trims that whitespace. This confuses the vscode intellisense engine, which then unhelpfully displays no completions with no user feedback that this filtering is happening. To avoid this, we now detect when this case occurs, and split up the change into non-overlapping edits from before the current line. Fixes dotnet/vscode-csharp#4600.