allow specifying shortcut for Custom Search Engines + URL bug in CLion

[peter-joo]

applies for the following versions:
CodeSearch version 1.1.0
CLion 2022.1.3

A)
There is no possibility to set up a shortcut (called Keymap in Clion's setting) for the Custom Search Engine.
For the default search engines the possibility is there.
Having a shortcut to trigger the Custom Search Service is a must to use this plugin.
Right clicking and selecting the Custom Search Service form the context menu is as hard as doing Ctrl-C, Alt-Tab, Ctrl-V on the Browser's search bar. Not convenient.

B)
Also what's the pattern which is substituted in the desired URL?
In this GIF it seems that the pattern (=selected text) is appended to the end of the Custom Search URL I specified.
https://raw.githubusercontent.com/guojianhua/code-search/master/imgs/add-search-service.gif

But it is not the case, unfortunately.
How it really works?

For example suppose I select/highlight a word called 'epsilon' by double clicking on it.
I would want to go to cppreference.com with this search URL
https://en.cppreference.com/mwiki/index.php?title=Special%3ASearch&fulltext=1&search=epsilon

It doesn't work, by running the Custom Search from context menu CLion/COdeSearch opens the browser with the following URL:
https://en.cppreference.com/mwiki/index.php?title=Special%3ASearch&fulltext=1&search=

The 'epsilon' is not there :(