Show menu on click, not hover. (#243)
Show menu on click, not hover. (#243)

* Show menu on click, not hover.

Previously, users had to be careful to not move the mouse
outside the menu (otherwise it would disappear unintentionally).

Also fixed a minor bug where we were not overwriting URL
parameters correctly when no selection was made.

* Use vendor prefixes for user-select.

google/pprof,rauls5382/pprof,google/pprof,google/pprof,rauls5382/pprof,google/pprof