make sure dragging a button triggers the scripts (applets/tablets)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@24947 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Make sure we update the lastFontSize variable so that we can speed up drawing labels.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@24948 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e