realsense: fix hasMouse()

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37834 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Don't mess with DOM if no keyboard is needed

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37835 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Ticket #3420: copying base64 to clipboard or to a new browser tab, and I've just found out that this probably doesn't work because we can only avoid the built-in popup blockers by onclick events, and no onkeyup, so work in progress...

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37836 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e