fix(spell): handle error of SPC t S

autoload/SpaceVim/layers/checkers.vim

@@ -310,6 +310,7 @@ function! s:toggle_syntax_checker() abort
   elseif g:spacevim_lint_engine ==# 'ale'
     ALEToggle
   endif
+  return 1
 endfunction
 
 

autoload/SpaceVim/layers/core/statusline.vim

@@ -701,18 +701,21 @@ endfunction
 " This func is used to toggle major mode in statusline
 
 function! SpaceVim#layers#core#statusline#toggle_mode(name) abort
-  if index(s:loaded_modes, a:name) != -1
-    call remove(s:loaded_modes, index(s:loaded_modes, a:name))
-  else
-    call add(s:loaded_modes, a:name)
-  endif
   let mode = get(s:modes, a:name, {})
   call SpaceVim#logger#info('try to call func of mode:' . a:name)
   if has_key(mode, 'func')
-    call call(mode.func, [])
+    let done = call(mode.func, [])
   else
+    let done = 1
     call SpaceVim#logger#info('no func found for mode:' . a:name)
   endif
+  if index(s:loaded_modes, a:name) != -1
+    call remove(s:loaded_modes, index(s:loaded_modes, a:name))
+  else
+    if done
+      call add(s:loaded_modes, a:name)
+    endif
+  endif
   let &l:statusline = SpaceVim#layers#core#statusline#get(1)
   call s:update_conf()
 endfunction

autoload/SpaceVim/layers/ui.vim

@@ -432,13 +432,21 @@ function! s:toggle_spell_check() abort
   if &l:spell
     let &l:spell = 0
   else
-    let &l:spell = 1
+    let v:errmsg = ''
+    silent! let &l:spell = 1
   endif
-  if &l:spell == 1
-    echo 'spell-checking enabled.'
+  if v:errmsg !=# ''
+    echo 'failed to enable spell check'
+    silent! let &l:spell = 0
+    return 0
   else
-    echo 'spell-checking disabled.'
+    if &l:spell == 1
+      echo 'spell-checking enabled.'
+    else
+      echo 'spell-checking disabled.'
+    endif
   endif
+  return 1
 endfunction
 
 function! s:toggle_paste() abort
@@ -452,6 +460,7 @@ function! s:toggle_paste() abort
   else
     echo 'paste-mode disabled.'
   endif
+  return 1
 endfunction
 
 let s:whitespace_enable = 0