Gnome terminal doesn't repaint when you select some text (drag on window) and then deselect (click once on same window) some text. Drag another window over it and the highlight goes away, though.
Verified by DLT, 18 MAY 1999.
Fixed as of gnome-libs-1.0.10, which will be released as an update soon.
Commit pushed to master at https://github.com/openshift/origin-web-console https://github.com/openshift/origin-web-console/commit/c2adf9259791598a27c58dd3a554f1b29bd5019d Fix for console issue #2892