make _fzf_complete_COMMAND work for aliases of COMMAND

[svenXY]

• [x] I have read through the manual page (man fzf)
• [x] I have the latest version of fzf
• [x] I have searched through the existing issues

Info

• OS
  • [ ] Linux
  • [x] Mac OS X
  • [ ] Windows
  • [ ] Etc.
• Shell
  • [ ] bash
  • [x] zsh
  • [ ] fish

Problem / Steps to reproduce

I'm trying to add _fzf_complete_COMMAND for timew (timewarrior), which works fine. Now I have a few aliases defined that spare me from typing "timew command" all the time (twa, twc, two and the like)

Following your suggestion in #1368, I could write functions for every of these aliases and make them use the one for timew, but I wonder if there's a better option.

Is there any possibility to first expand the alias and then apply the completion function?

Thanks, Sven