Add documentation for hide_nonpublic

Also indicate in the statusline if non-public tags are currently hidden.

autoload/tagbar.vim

@@ -2797,6 +2797,7 @@ function! s:PrintHelp() abort
         silent  put ='\" ' . s:get_map_str('nexttag') . ': Go to next top-level tag'
         silent  put ='\" ' . s:get_map_str('prevtag') . ': Go to previous top-level tag'
         silent  put ='\" ' . s:get_map_str('showproto') . ': Display tag prototype'
+        silent  put ='\" ' . s:get_map_str('hidenonpublic') . ': Hide non-public tags'
         silent  put ='\"'
         silent  put ='\" ---------- Folds ----------'
         silent  put ='\" ' . s:get_map_str('openfold') . ': Open fold'
@@ -3654,6 +3655,7 @@ endfunction
 function! s:ToggleHideNonPublicTags() abort
     let g:tagbar_hide_nonpublic = !g:tagbar_hide_nonpublic
     call s:RenderKeepView()
+    call s:SetStatusLine('current')
 endfunction
 
 " s:IsValidFile() {{{2
@@ -3722,7 +3724,8 @@ function! s:SetStatusLine(current)
         let &l:statusline = call(g:tagbar_status_func, args)
     else
         let colour = current ? '%#StatusLine#' : '%#StatusLineNC#'
-        let text = colour . '[' . sort . '] ' . fname
+        let hide = g:tagbar_hide_nonpublic ? '[h] ' : ''
+        let text = colour . '[' . sort . '] ' . hide . fname
         let &l:statusline = text
     endif
 

doc/tagbar.txt

@@ -331,6 +331,9 @@ P             Open the tag in a |preview-window|.
 <Space>       Display the prototype of the current tag (i.e. the line defining
               it) in the command line.
                 Map option: tagbar_map_showproto
+h             Hide tags that are declared non-public. Tags without any
+              visibility information will still be shown.
+                Map option: tagbar_map_hidenonpublic
 +/zo          Open the fold under the cursor.
                 Map option: tagbar_map_openfold
 -/zc          Close the fold under the cursor or the current one if there is
@@ -506,6 +509,19 @@ Example:
         let g:tagbar_show_linenumbers = 2
 <
 
+                                                     *g:tagbar_hide_nonpublic*
+g:tagbar_hide_nonpublic~
+Default: 0
+
+Hide tags that are declared non-public. Tags without any visibility
+information will still be shown. This can also be toggled with a key, see
+|tagbar-keys|.
+
+Example:
+>
+        let g:tagbar_hide_nonpublic = 1
+<
+
                                                              *g:tagbar_expand*
 g:tagbar_expand~
 Default: 0