From d16ec1198b5d178219ecb94c67e684c606f2aad5 Mon Sep 17 00:00:00 2001
From: Jan Larres <jan@majutsushi.net>
Date: Sun, 23 Oct 2016 20:09:46 +1300
Subject: [PATCH] Don't consider file as valid if its window is in diff mode

---
 autoload/tagbar.vim | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/autoload/tagbar.vim b/autoload/tagbar.vim
index 00af56b..f1de207 100644
--- a/autoload/tagbar.vim
+++ b/autoload/tagbar.vim
@@ -4024,6 +4024,12 @@ function! s:IsValidFile(fname, ftype) abort
         return 0
     endif
 
+    let winnr = bufwinnr(a:fname)
+    if winnr != -1 && getwinvar(winnr, '&diff')
+        call s:debug('Window is in diff mode')
+        return 0
+    endif
+
     if &previewwindow
         call s:debug('In preview window')
         return 0