change events for updating the statusline, from BufWinEnter,FileType to BufEnter (close #352)

- fix the active statusline after updating the quickfix/location list
- use g:qf_disable_statusline to disable the statusline of the default ftplugin
- for before Vim 8.1.1715, keep using FileType event to overwrite the statusline of the quickfix window

.travis.yml

@@ -18,6 +18,7 @@ cache:
     - $HOME/vim-$VIM_VERSION
 
 env:
+  - VIM_VERSION=8.1.1775
   - VIM_VERSION=8.1.1700
   - VIM_VERSION=8.1.0000
   - VIM_VERSION=8.0.0000

autoload/lightline.vim

@@ -2,7 +2,7 @@
 " Filename: autoload/lightline.vim
 " Author: itchyny
 " License: MIT License
-" Last Change: 2019/07/20 12:00:00.
+" Last Change: 2019/07/30 12:00:00.
 " =============================================================================
 
 let s:save_cpo = &cpo
@@ -46,7 +46,10 @@ function! lightline#enable() abort
   call lightline#update()
   augroup lightline
     autocmd!
-    autocmd WinEnter,BufWinEnter,FileType,SessionLoadPost * call lightline#update()
+    autocmd WinEnter,BufEnter,SessionLoadPost * call lightline#update()
+    if !has('patch-8.1.1715')
+      autocmd FileType qf call lightline#update()
+    endif
     autocmd SessionLoadPost * call lightline#highlight()
     autocmd ColorScheme * if !has('vim_starting') || expand('<amatch>') !=# 'macvim'
           \ | call lightline#update() | call lightline#highlight() | endif

plugin/lightline.vim

@@ -2,7 +2,7 @@
 " Filename: plugin/lightline.vim
 " Author: itchyny
 " License: MIT License
-" Last Change: 2018/06/22 08:49:00.
+" Last Change: 2019/07/30 12:00:00.
 " =============================================================================
 
 if exists('g:loaded_lightline') || v:version < 700
@@ -15,12 +15,20 @@ set cpo&vim
 
 augroup lightline
   autocmd!
-  autocmd WinEnter,BufWinEnter,FileType,SessionLoadPost * call lightline#update()
+  autocmd WinEnter,BufEnter,SessionLoadPost * call lightline#update()
+  if !has('patch-8.1.1715')
+    autocmd FileType qf call lightline#update()
+  endif
   autocmd SessionLoadPost * call lightline#highlight()
   autocmd ColorScheme * if !has('vim_starting') || expand('<amatch>') !=# 'macvim'
         \ | call lightline#update() | call lightline#highlight() | endif
   autocmd CursorMoved,BufUnload * call lightline#update_once()
 augroup END
 
+" This quickfix option was introduced at Vim 85850f3a5ef9, which is the commit
+" just before 8.1.1715. Before this patch, autocmd FileType is required to
+" overwrite the statusline of the quickfix and location windows.
+let g:qf_disable_statusline = 1
+
 let &cpo = s:save_cpo
 unlet s:save_cpo

test/.themisrc

@@ -18,3 +18,5 @@ endfunction
 function! SID(name) abort
   return function(printf("\<SNR>%d_%s", s:sid('autoload/lightline.vim'), a:name))
 endfunction
+
+filetype plugin on

test/quickfix.vim

@@ -0,0 +1,25 @@
+let s:suite = themis#suite('quickfix')
+let s:assert = themis#helper('assert')
+
+function! s:suite.before_each()
+  let g:lightline = {}
+  call lightline#init()
+  tabnew
+  tabonly
+endfunction
+
+function! s:suite.quickfix_statusline()
+  call setloclist(winnr(), [])
+  lopen
+  wincmd p
+  call setloclist(winnr(), [])
+  for n in range(1, winnr('$'))
+    let statusline = getwinvar(n, '&statusline')
+    call s:assert.match(statusline, 'lightline')
+    if has('patch-8.1.1715')
+      call s:assert.match(statusline, n == 1 ? '_active_' : '_inactive_')
+    else
+      call s:assert.match(statusline, n != 1 ? '_active_' : '_inactive_')
+    endif
+  endfor
+endfunction