fzf incompatible with xcape/setxkbmap

- Category
- [x] fzf binary
- [ ] fzf-tmux script
- [x] Key bindings
- [ ] Completion
- [ ] Vim
- [ ] Neovim
- [ ] Etc.
- OS
- [x] Linux
- [ ] Mac OS X
- [ ] Windows
- [ ] Windows Subsystem for Linux
- [ ] Etc.
- Shell
- [x] bash
- [ ] zsh
- [ ] fish

In my bashrc map my caps lock key to be ctrl on hold and escape on tap as follows:
```
setxkbmap -option ctrl:nocaps
xcape -e 'Control_L=Escape'
```
When I launch fzf after this setup, tapping escape to exit does not work - I need to press ctrl-c (caps-c since I've remapped it) to exit. Moreover, it seems that for every tap of escape I need to press ctrl-c to pop it off some stack before the final ctrl-c quits. I think this is related to a general problem of respecting keyboard mappings (see https://github.com/junegunn/fzf/issues/1291). On OSX w/ karabiner and/or keyboard maestro I did not have this problem.

I am running fzf version 0.17.3

Start by reproducing the issue from the bashrc setup using setxkbmap, xcape, and fzf 0.17.3, then compare the keyboard-mapping behavior discussed in issue 1291. Done means tapping the remapped Escape exits fzf without requiring repeated Ctrl-C presses.

Written by the indexing model from the issue text.