<C-r>= command line evaluation not working

[simlei]

Hi, I have encountered the problem that I cannot evaluate expressions with <C-R>=on the search input line as is possible without incsearch, or the usual ex-mode command line (press : in normal mode). I have then looked into your code base and discovered, it would be harrowingly complex to fix for me as an outsider since you use a custom command line implementation with plugins and whatnot. I had looked along the lines with an issue fixed earlier where the feature to insert the / register into the command line -- even that was too complex for me to follow where happens what :(

Unfortunately, this is a dealbreaker, as custom sesarch command mappings that rely on <C-R>= are quite powerful. Any idea on whether you would be coming around to add that feature to your otherwise super awesome and well done plugin?

Thanks