feat(app): better diff/code comments (#14621)

Co-authored-by: adamelmore <2363879+adamdottv@users.noreply.github.com>
Co-authored-by: David Hill <iamdavidhill@gmail.com>

packages/app/src/context/file/view-cache.ts

@@ -9,7 +9,7 @@ const MAX_FILE_VIEW_SESSIONS = 20
 const MAX_VIEW_FILES = 500
 
 function normalizeSelectedLines(range: SelectedLineRange): SelectedLineRange {
-  if (range.start <= range.end) return range
+  if (range.start <= range.end) return { ...range }
 
   const startSide = range.side
   const endSide = range.endSide ?? startSide