From ed48f254f1fb2f037556ed4847cfcf41a586861a Mon Sep 17 00:00:00 2001
From: Amit Haridas <amit.wh@gmail.com>
Date: Wed, 4 Mar 2026 15:42:09 +0530
Subject: [PATCH] feat: migrate find/replace to use CodeMirror search

---
 src/renderer.js | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/src/renderer.js b/src/renderer.js
index 4b066c0..39dfe77 100644
--- a/src/renderer.js
+++ b/src/renderer.js
@@ -853,13 +853,22 @@ class TabManager {
         const findText = document.getElementById('find-input').value;
         const replaceText = document.getElementById('replace-input').value;
 
-        if (!tab || !tab.editorView || !findText) return;
+        if (!tab || !tab.editorView || !findText || tab.findMatches.length === 0) return;
 
-        const content = this.getEditorContent();
-        const newContent = content.split(findText).join(replaceText);
+        const view = tab.editorView;
         const replacedCount = tab.findMatches.length;
 
-        this.setEditorContent(this.activeTabId, newContent);
+        // Build all changes as a single transaction for proper undo support.
+        // Changes must be provided in document order; findMatches is already sorted.
+        const changes = tab.findMatches.map(pos => ({
+            from: pos,
+            to: pos + findText.length,
+            insert: replaceText,
+        }));
+
+        view.dispatch({ changes });
+
+        tab.content = view.state.doc.toString();
         tab.isDirty = true;
 
         this.updatePreview(this.activeTabId);