Fixed warnings

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27806 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Removed redundant typecasts

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27807 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
resize of browseGUI

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27808 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
move sliders; prevent storing unnecessary undoInfos

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27809 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e