Merge pull request #414 from lambdalisue/fix-413

Restore `winfixwidth` automatically

Author: lambdalisue

autoload/fern.vim

@@ -31,6 +31,7 @@ call s:Config.config(expand('<sfile>:p'), {
       \ 'disable_drawer_hover_popup': 0,
       \ 'disable_drawer_tabpage_isolation': 0,
       \ 'disable_drawer_auto_restore_focus': 0,
+      \ 'disable_drawer_auto_restore_winfixwidth': 0,
       \ 'default_hidden': 0,
       \ 'default_include': '',
       \ 'default_exclude': '',

autoload/fern/internal/drawer.vim

@@ -50,9 +50,11 @@ function! fern#internal#drawer#init() abort
   call fern#internal#drawer#auto_resize#init()
   call fern#internal#drawer#auto_winfixwidth#init()
   call fern#internal#drawer#auto_restore_focus#init()
+  call fern#internal#drawer#auto_restore_winfixwidth#init()
   call fern#internal#drawer#smart_quit#init()
   call fern#internal#drawer#hover_popup#init()
   call fern#internal#drawer#resize()
+
   setlocal winfixwidth
 endfunction
 

autoload/fern/internal/drawer/auto_restore_winfixwidth.vim

@@ -0,0 +1,20 @@
+function! fern#internal#drawer#auto_restore_winfixwidth#init() abort
+  if g:fern#disable_drawer_auto_restore_winfixwidth
+    return
+  endif
+
+  let b:fern_drawer_auto_restore_winfixwidth = get(b:, 'fern_drawer_auto_restore_winfixwidth', &winfixwidth)
+
+  augroup fern_internal_drawer_auto_restore_winfixwidth
+    autocmd! * <buffer>
+    autocmd BufWinLeave <buffer> call s:restore_winfixwidth()
+  augroup END
+endfunction
+
+function! s:restore_winfixwidth() abort
+  if !exists('b:fern_drawer_auto_restore_winfixwidth')
+    return
+  endif
+  let &winfixwidth = b:fern_drawer_auto_restore_winfixwidth
+  silent! unlet! b:fern_drawer_auto_restore_winfixwidth
+endfunction

doc/fern.txt

@@ -500,6 +500,12 @@ VARIABLE						*fern-variable*
 <
 	Default: 0 
 
+*g:fern#disable_drawer_auto_restore_winfixwidth*
+	Set 1 to disable automatically restore 'winfixwidth' on |BufWinLeave|
+	autocmd.
+
+	Default: 0
+
 *g:fern#default_hidden*
 	Set 1 to enter hidden mode (show hidden files) in default.
 	Default: 0