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Description
issue-2850306930

current: In VSCode, there is a function called "write a doc string" in the right-click menu, which passes a parameter "onlyOneInsertion" to streamEdit, which only allows receiving up to one line of duplicate content.
Problem: Except for the first line, all other content will be delete by function reapplyWithMyersDiff,cause by wrong range

fixed:
when params onlyOneInsertion is true,set endrange = startrange
[ What changed? Feel free to be brief. ]
Checklist
Screenshots
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Tests
[ What tests were added or updated to ensure the changes work as expected? ]