Limit the number of initially visible parameters in the parameter search widget

* Truncate beyond 3 parameters
* Add a special option class that, when clicked, shows the remaining parameters
* Use a special option class for the no parameters item instead of hacking the normal one
* Simplify the design of the no parameters item: no icon, centered text

Change-Id: Ia8259e91b42a59c2b08019df36217d485208ad99
Merge "Limit the number of initially visible parameters in the parameter search widget"