Do not close the regular polygon input dialog if the user writes a wrong value in it. (A little bit associated with #4011)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31604 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Ticket #2825: prevent the Graphics View from moving when a point is edited in the Algebra View

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31605 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e