v1.9.15: fix minimize/restore — remove grab_set, add Win32 restore fallback

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

gui/about_dialog.py

@@ -15,10 +15,12 @@ class AboutDialog(ctk.CTkToplevel):
         self.geometry("500x480")
         self.resizable(False, False)
         self.transient(master)
-        self.grab_set()
         self.focus_force()
         self.protocol("WM_DELETE_WINDOW", self._on_close)
 
+        self._master_ref = master
+        self._map_bind_id = master.bind("<Map>", self._on_parent_map, add="+")
+
         # ── Header ──
         ctk.CTkLabel(
             self, text=t("about_title"),
@@ -78,9 +80,20 @@ class AboutDialog(ctk.CTkToplevel):
             self, text=t("close"), width=120, command=self._on_close
         ).pack(pady=(10, 20))
 
+    def _on_parent_map(self, event=None):
+        """Restore dialog when parent is un-minimized."""
+        try:
+            if not self.winfo_exists():
+                return
+            self.deiconify()
+            self.lift()
+            self.focus_force()
+        except Exception:
+            pass
+
     def _on_close(self):
         try:
-            self.grab_release()
+            self._master_ref.unbind("<Map>", self._map_bind_id)
         except Exception:
             pass
         self.destroy()