v1.9.19: fix offscreen window — validate saved geometry, reject -32000 coords

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

gui/app.py

@@ -91,7 +91,7 @@ class App(ctk.CTk):
 
         # Restore saved window geometry or use default
         saved_geo = self.store._window_geometry
-        if saved_geo:
+        if saved_geo and self._is_valid_geometry(saved_geo):
             self.geometry(saved_geo)
         else:
             self.geometry("1100x700")
@@ -667,10 +667,25 @@ class App(ctk.CTk):
         except Exception:
             pass
 
+    @staticmethod
+    def _is_valid_geometry(geo: str) -> bool:
+        """Reject geometry with offscreen coordinates (e.g. minimized -32000)."""
+        try:
+            # format: WxH+X+Y or WxH-X-Y
+            import re
+            m = re.match(r"(\d+)x(\d+)([+-]\d+)([+-]\d+)", geo)
+            if not m:
+                return False
+            x, y = int(m.group(3)), int(m.group(4))
+            return -100 < x < 10000 and -100 < y < 10000
+        except Exception:
+            return False
+
     def _on_close(self):
         # Save window geometry (size + position) and sidebar width
         try:
-            self.store._window_geometry = self.geometry()
+            geo = self.geometry()
+            self.store._window_geometry = geo if self._is_valid_geometry(geo) else None
             # Save sidebar width from PanedWindow sash position
             try:
                 sash_pos = self._paned.sash_coord(0)