ETM-Code · paplm · Sep 4, 2026
diff --git a/index.html b/index.html
@@ -9,9 +9,9 @@
   </head>
   <body>
     <div id="app">
-      <header id="titlebar" data-tauri-drag-region>
+      <header id="titlebar">
         <div class="traffic-lights-spacer"></div>
-        <div class="title" data-tauri-drag-region>
+        <div class="title">
           <span id="filename">untitled.md</span>
           <span id="modified-indicator" class="hidden" title="Unsaved changes"></span>
         </div>

diff --git a/src-tauri/Cargo.toml b/src-tauri/Cargo.toml
@@ -31,4 +31,3 @@ serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 tauri-plugin-deep-link = "2.4.6"
 url = "2.5.8"
-
diff --git a/src-tauri/capabilities/default.json b/src-tauri/capabilities/default.json
@@ -9,6 +9,7 @@
     "core:window:allow-destroy",
     "core:window:allow-set-title",
     "core:window:allow-set-focus",
+    "core:window:allow-set-position",
     "opener:default",
     "dialog:default",
     "fs:default",

diff --git a/src/main.ts b/src/main.ts
@@ -1,5 +1,7 @@
 import type { Editor } from '@tiptap/core'
 import { TextSelection } from '@tiptap/pm/state'
+import { LogicalPosition } from '@tauri-apps/api/dpi'
+import { getCurrentWindow } from '@tauri-apps/api/window'
 import { createQuillEditor, ensureGrammarsForDoc, getMarkdown, setMarkdown } from './editor-setup'
 import { FileOps } from './file-ops'
 import { selectStartupFiles } from './startup-files'
@@ -86,6 +88,37 @@ document.addEventListener('DOMContentLoaded', async () => {
   const modifiedIndicator = document.getElementById('modified-indicator')!
   const wordCountEl = document.getElementById('word-count')!
   const editorEl = document.getElementById('editor')!
+  const titlebarEl = document.getElementById('titlebar')!
+
+  // macOS 27 can reject AppKit's performWindowDragWithEvent for an overlay
+  // titlebar. Move only this header by cursor delta instead; the editor never
+  // receives this listener, so text selection and its own drag/drop are intact.
+  titlebarEl.addEventListener('mousedown', async event => {
+    if (event.button !== 0) return
+    event.preventDefault()
+
+    try {
+      const win = getCurrentWindow()
+      const [position, scale] = await Promise.all([win.outerPosition(), win.scaleFactor()])
+      const startX = event.screenX
+      const startY = event.screenY
+
+      const move = (moveEvent: MouseEvent) => {
+        const x = position.x / scale + moveEvent.screenX - startX
+        const y = position.y / scale + moveEvent.screenY - startY
+        void win.setPosition(new LogicalPosition(x, y))
+      }
+      const stop = () => {
+        window.removeEventListener('mousemove', move)
+        window.removeEventListener('mouseup', stop)
+      }
+
+      window.addEventListener('mousemove', move)
+      window.addEventListener('mouseup', stop, { once: true })
+    } catch {
+      // Browser-based harness: no native window.
+    }
+  })
 
   // --- editor ---
   let fileOps: FileOps

diff --git a/src/styles.css b/src/styles.css
@@ -84,7 +84,6 @@ button {
   background: var(--bg-primary);
   user-select: none;
   -webkit-user-select: none;
-  -webkit-app-region: drag;
   flex-shrink: 0;
 }
Original file line number	Diff line number	Diff line change
Expand Up		@@ -31,4 +31,3 @@ serde = { version = "1", features = ["derive"] }
		serde_json = "1"
		tauri-plugin-deep-link = "2.4.6"
		url = "2.5.8"