Don't highlight the same tag again, closes #36

autoload/tagbar.vim

@@ -90,6 +90,8 @@ let s:access_symbols = {
 
 let g:loaded_tagbar = 1
 
+let s:last_highlight_tline = 0
+
 " s:InitTypes() {{{2
 function! s:InitTypes()
     let s:known_types = {}
@@ -2059,6 +2061,9 @@ function! s:RenderContent(...)
         " window by jumping to the top after drawing
         execute 1
         call winline()
+
+        " Invalidate highlight cache from old file
+        let s:last_highlight_tline = 0
     endif
 
     let &lazyredraw  = lazyredraw_save
@@ -2235,6 +2240,15 @@ function! s:HighlightTag()
         let tagline = tag.tline
     endif
 
+    " Don't highlight the tag again if it's the same one as last time.
+    " This prevents the Tagbar window from jumping back after scrolling with
+    " the mouse.
+    if tagline == s:last_highlight_tline
+        return
+    else
+        let s:last_highlight_tline = tagline
+    endif
+
     let eventignore_save = &eventignore
     set eventignore=all