Add a timeout on mouseLevel to help with hovering tooltip of chart header icons
Add a timeout on mouseLevel to help with hovering tooltip of chart header icons


Former-commit-id: bad1725d387f9ea2d037ff5f43abe6c3b4402eb0
alisman/cbioportal-frontend,alisman/cbioportal-frontend,alisman/cbioportal-frontend,alisman/cbioportal-frontend,cBioPortal/cbioportal-frontend,cBioPortal/cbioportal-frontend,alisman/cbioportal-frontend,alisman/cbioportal-frontend,cBioPortal/cbioportal-frontend,cBioPortal/cbioportal-frontend,cBioPortal/cbioportal-frontend,cBioPortal/cbioportal-frontend