Fixed minimal zoom and message area width

Changes.txt

@@ -22,6 +22,8 @@
     a game. This allows the user to save high scores for these games. For each
     game and variation, the top 10 scores can be saved. (TODO: Doc)
 
+  * Added interactive palette to Video & Audio settings
+
   * Added 'Custom' palette, generated from user controlled phase shifts.
 
   * Added 'Turbo' mode, runs the game as fast as the computer allows.

src/emucore/FrameBuffer.cxx

@@ -171,10 +171,9 @@ void FrameBuffer::setupFonts()
     //  However, we have to make sure all Dialogs are sized using the fontsize.
     int zoom_h = (fd.height * 4 * 2) / GUI::stellaMediumDesc.height;
     int zoom_w = (fd.maxwidth * 4 * 2) / GUI::stellaMediumDesc.maxwidth;
-    myTIAMinZoom = std::max(zoom_w, zoom_h) / 4.F; // round to 25% steps
+    myTIAMinZoom = std::max(std::max(zoom_w, zoom_h) / 4.F, 2.F); // round to 25% steps, >= 200%
   }
 
-
   // The font used by the ROM launcher
   const string& lf = myOSystem.settings().getString("launcherfont");
 
@@ -310,7 +309,7 @@ FBInitStatus FrameBuffer::createDisplay(const string& title, BufferType type,
   }
 
   if(!myMsg.surface)
-    myMsg.surface = allocateSurface(FBMinimum::Width, font().getFontHeight() * 1.5);
+    myMsg.surface = allocateSurface(font().getMaxCharWidth() * 56, font().getFontHeight() * 1.5);
 #endif
 
   // Print initial usage message, but only print it later if the status has changed