The statusline is only dynamically updated for the active buffer, thus
when there are multiple splits the statusline for inactive buffers may
include non-updated output of `coc#status()`. This patch adds a boolean
flag to `statusline#generic()` which enables `statusline#active()` and
`statusline#inactive()` to control when `coc#status()` is included in
the statusline.
Kenneth Benzie (Benie)
c9711deade