* ivy.el (ivy--exhibit): Remove the condition on (eq ivy--full-length -1).
* counsel.el (counsel-git-grep-function): Simplify.
(counsel-gg-state): New defvar. Use this instead of
(setq ivy--full-length -1).
(counsel--gg-candidates): Set `counsel-gg-state' to -2. There are two
async processes to wait for until `ivy--exhibit' can be called:
- get the candidate count
- get the candidates
Each of the async processes will increase the number, and call
`ivy--exhibit' if the number reaches 0.
(counsel--gg-sentinel): Update.
(counsel--gg-count): Update.