As in title: let's include assigned values of template parameters in code search!
As of 2019.2, a quick test showed that the value assigned to such a parameter is not found when doing a code search.
The workaround is to include generated code in the search, but that tends to return superfluous results.
Searching on generated code is not the workaround, it is the actual code you are investigating. Even though they lead to code, the parameter values themselves are not code that should be searched. If you would get a parameter value as a result, you would have no context how it is used in the code whatsoever.
Also, unfortunately, this idea has not received enough votes. Because we want to keep the focus on ideas that are in high demand in our Community, we are closing this idea.