fix current zoom level when enabling bezels

Changes.txt

@@ -24,7 +24,7 @@
 
   * Added 2nd UI theme and hotkey for toggling UI theme.
 
-  * Added bezel support.
+  * Added bezel support (incl. Sinden Lightgun).
 
   * Added optional type format detection based on colors used.
 

src/emucore/FrameBuffer.cxx

@@ -1277,6 +1277,14 @@ void FrameBuffer::toggleBezel(bool toggle)
       enabled = !enabled;
       myOSystem.settings().setValue("bezel.show", enabled);
       myBezel->load();
+
+      // Determine possible TIA windowed zoom levels
+      const double currentTIAZoom =
+        static_cast<double>(myOSystem.settings().getFloat("tia.zoom"));
+      myOSystem.settings().setValue("tia.zoom",
+        BSPF::clamp(currentTIAZoom, supportedTIAMinZoom(), supportedTIAMaxZoom()));
+
+      saveCurrentWindowPosition();
       applyVideoMode();
     }
   }