Adds the three regression tests the PR body claimed but #1389 had not actually shipped:
- $-prefixed identifier resolution: asserts resolveSymbolColumn("$store")
on a line with bar$store + $store returns the standalone column (16),
not the substring inside the compound identifier (7).
- create→edit ordering on the same URI: the motivating LSP §3.16.2 case
("Extract to new file" code actions emitting [CreateFile, TextDocumentEdit]
for the same URI). Pre-fix this threw ENOENT.
- Folder-delete subtree flush: mirror of the existing folder-rename test
for the delete arm — child-file edits must land before the parent folder
goes away.
Also adds a CHANGELOG sentence noting that when a WorkspaceEdit supplies
both `changes` and `documentChanges`, the new code uses documentChanges
exclusively per LSP §3.16.2 (previously the two were merged).
oldschoola
5cdc450fa6