Reproduce:
1. Click on the App Launcher button, App Launcher displays
2. Click on any app
3. The first click do nothing
Expect: App should be opened immediately after clicked

Happens inconsistently on Chrome and only when using "tap to click" on trackpad.

Happens on Safari.

Does not happen on Firefox.

Possible culprit logic is related to com.googlecode.mgwt.ui.client.widget.touch.TouchDelegate: the utility that was used to have the same handlers for the touch (on tablet devices) and clicks (on desktops). One possible solution is to try to ditch that class (and see how the component would behave on tablets).