Trim edits if possible.

- Since we're now LLM correcting a lot of problematic edits we need to also potentially trim bad edits (llms have a bad habbit of adding whitespace places).

Part of https://github.com/google-gemini/gemini-cli/issues/484

packages/server/src/utils/editCorrector.ts

@@ -136,6 +136,14 @@ export async function ensureCorrectEdit(
     }
   }
 
+  const { targetString, pair } = trimPairIfPossible(
+    finalOldString,
+    finalNewString,
+    currentContent,
+  );
+  finalOldString = targetString;
+  finalNewString = pair;
+
   // Final result construction
   const result: CorrectedEditResult = {
     params: {
@@ -359,6 +367,33 @@ Return ONLY the corrected string in the specified JSON format with the key 'corr
   }
 }
 
+function trimPairIfPossible(
+  target: string,
+  trimIfTargetTrims: string,
+  currentContent: string,
+) {
+  const trimmedTargetString = target.trim();
+  if (target.length !== trimmedTargetString.length) {
+    const trimmedTargetOccurrences = countOccurrences(
+      currentContent,
+      trimmedTargetString,
+    );
+
+    if (trimmedTargetOccurrences === 1) {
+      const trimmedReactiveString = trimIfTargetTrims.trim();
+      return {
+        targetString: trimmedTargetString,
+        pair: trimmedReactiveString,
+      };
+    }
+  }
+
+  return {
+    targetString: target,
+    pair: trimIfTargetTrims,
+  };
+}
+
 /**
  * Unescapes a string that might have been overly escaped by an LLM.
  */