Add auto-previewing mode, closes #161

autoload/tagbar.vim

@@ -967,6 +967,10 @@ function! s:CreateAutocommands() abort
         autocmd WinEnter   __Tagbar__ call s:SetStatusLine('current')
         autocmd WinLeave   __Tagbar__ call s:SetStatusLine('noncurrent')
 
+        if g:tagbar_autopreview
+            autocmd CursorMoved __Tagbar__ nested call s:ShowInPreviewWin()
+        endif
+
         autocmd WinEnter * if bufwinnr('__Tagbar__') == -1 |
                          \     call s:ShrinkIfExpanded() |
                          \ endif

doc/tagbar.txt

@@ -564,6 +564,18 @@ Example:
         let g:tagbar_autoshowtag = 1
 <
 
+                                                        *g:tagbar_autopreview*
+g:tagbar_autopreview~
+Default: 0
+
+If this variable is set to 1 then moving the cursor in the Tagbar window will
+automatically show the current tag in the preview window.
+
+Example:
+>
+        let g:tagbar_autopreview = 1
+<
+
                                               *g:tagbar_updateonsave_maxlines*
 g:tagbar_updateonsave_maxlines~
 

plugin/tagbar.vim

@@ -51,6 +51,7 @@ endfunction
 let s:options = [
     \ ['autoclose', 0],
     \ ['autofocus', 0],
+    \ ['autopreview', 0],
     \ ['autoshowtag', 0],
     \ ['compact', 0],
     \ ['expand', 0],