fixed Launcher filtering of ZIPs not containing any valid ROMs

Changes.txt

@@ -15,9 +15,12 @@
 6.6 to 6.?
 
   * Reworked the file launcher:
+    - Redesigned user interface
     - Added tracking of user favorites, recently played and most popular
       games.
     - Added virtual directories for selecting tracked games.
+    - Added quick path navigation
+    - Added navigation history
     - Added icons for files and directories.
     - Added option to show/hide file extensions.
     - Extended context menu and shortcuts.

src/gui/LauncherDialog.cxx

@@ -605,7 +605,10 @@ void LauncherDialog::applyFiltering()
       if(!node.isDirectory())
       {
         // Do we want to show only ROMs or all files?
-        if(myShowOnlyROMs && !Bankswitch::isValidRomName(node))
+        string ext;
+        if(myShowOnlyROMs &&
+            (!Bankswitch::isValidRomName(node, ext)
+              || BSPF::compareIgnoreCase(ext, "zip") == 0)) // exclude ZIPs without any valid ROMs
           return false;
 
         // Skip over files that don't match the pattern in the 'pattern' textbox