Handling statements from a known source file (#58679)

tests/cases/fourslash/server/pasteEdits_blankTargetFile.ts

@@ -8,7 +8,11 @@
 
 // @Filename: /b.ts
 //// import { abc } from "./a";
-//// console.log(abc);
+////
+//// [|console.log(abc);
+//// 
+//// |]
+//// console.log("abc");
 
 // @Filename: /tsconfig.json
 ////{ "files": ["c.ts", "a.ts", "b.ts"] }
@@ -18,6 +22,7 @@ verify.pasteEdits({
     args: {
         pastedText: [`console.log(abc);`],
         pasteLocations: [range[0]],
+        copiedFrom: { file: "b.ts", range: [range[1]] },
     },
     newFileContents: {
         "/c.ts":