dead keys are not propertly handled

[ecerulm]

When using a Keyboard Input of "US International PC" to actually type " I need to press " followed by space (which is fine). But it's not handled properly in VimR. It's all ok in insert mode but in operator-pending mode is not handled like in neovim in terminal or MacVim.

Let me explain with an example , I use surround.vim to change single quotes to double quotes with cs'" which in my case should be typed as cs' " . When I type that in VimR it gets interpreted as cs' and thus it changes single quotes to spaces. If I type cs'" nothing happens.

So VimR is handling keypresses diferently than neovim in iTerm

[ecerulm]

I was suffering the same problem in MacVim and today I got a solution from the @ychin
macvim-dev/macvim#610 (comment)

Maybe from there the developers of VimR can get a hint on what is wrong in VimR handling of macOS input methods.

A good testcase is to input the following text in the buffer:

 This text contain the swedish letter ö and the swedish letter ä but also " (the double quote symbol)

With the "U.S International PC" keyboard layout, pressing 0f"a should jump to the letter ä in the buffer but right not it jumps directly to the " as soon as I type 0f". In this keyboard layout pressing the quote doesn't really output a quote, it enters an state where it waits the next key if the next key is a it will produce ä. if the next key is space then it will output ". So f"a it's really fä.