handling of autorepeated key events in picker machines


git-svn-id: svn://svn.code.sf.net/p/qwt/code/trunk@1955 29e17f8d-cf37-471e-a288-72cc03a76eda
avoiding additional event filters for the internal overlays of a picker


git-svn-id: svn://svn.code.sf.net/p/qwt/code/trunk@1958 29e17f8d-cf37-471e-a288-72cc03a76eda
clicking next to the slider handle fixed


git-svn-id: svn://svn.code.sf.net/p/qwt/code/trunk@1961 29e17f8d-cf37-471e-a288-72cc03a76eda