* AS_GET_STRING_WIDTHS now uses this method to send the strings to the app_server;
ie. it no longer sends the whole strings, and it saves sending the string length
separately.
* BFont::StringWidth() will now always return 0.0f in case of an error (instead of
some random value)
* Minor cleanup.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@16525 a95241bf-73f2-0310-859d-f6bbb57e9c96
2ed942c199