SaveAs improvements

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34252 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Set back r34195, removing infinite loop due to repaintView()

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34253 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Make sure spreadsheet editor is not reduced to 5px or something

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34254 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Arc/sector center-two points is defined when points are aligned (single point)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34255 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
for browsers that don't support TRIANGLE_FAN : force it for all browsers (temporary fix)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34256 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e