Linux: skip invisible desktop files when looking up the default browser.

third_party/xdg-utils/scripts/xdg-settings

 #!/bin/sh
 #---------------------------------------------
 #   xdg-settings
 #
 #   Utility script to get various settings from the desktop environment.
 #
 #   Refer to the usage() function below for usage.
 #
 #   Copyright 2009, Google Inc.
 #
@@ skipping 505 matching lines @@
     binary="`which "$1"`"
     base="`basename "$1"`"
     IFS=:
     for dir in $search; do
         unset IFS
         [ "$dir" -a -d "$dir/applications" ] || continue
         for file in "$dir"/applications/*.desktop; do
             [ -r "$file" ] || continue
             # Check to make sure it's worth the processing
             grep -q "^Exec.*$base" "$file" || continue
+            # Make sure it's a visible desktop file (e.g. not "preferred-web-browser.desktop")
+            grep -q "^NoDisplay=true" "$file" && continue
             command="`grep "^Exec\(\[[^]=]*]\)\?=" "$file" | cut -d= -f 2- | first_word`"
             full="`which "$command"`"
             if [ x"$full" = x"$binary" ]; then
                 # Fix any double slashes that got added path composition
                 echo "$file" | sed -e 's,//*,/,g'
                 return
             fi
         done
     done
 }
@@ skipping 272 matching lines @@
     ;;
 
     generic)
     dispatch_generic "$@"
     ;;
 
     *)
     exit_failure_operation_impossible "unknown desktop environment"
     ;;
 esac