Add neomutt version of sidebar patch. (closes #3829)

This is the patch from neomutt; branch 'devel/win-sidebar'; commit
c796fa85f9cacefb69b8f7d8545fc9ba71674180 with the following changes:

  - move the sample muttrc and vimrc to contrib.
  - remove the README.sidebar.
  - empty out the PATCHES file.

1 files changed, 7 insertions, 0 deletions

diff --git a/flags.c b/flags.c
index 26802651..2d404f60 100644
--- a/flags.c
+++ b/flags.c
@@ -25,6 +25,10 @@
 #include "sort.h"
 #include "mx.h"
 
+#ifdef USE_SIDEBAR
+#include "sidebar.h"
+#endif
+
 void _mutt_set_flag (CONTEXT *ctx, HEADER *h, int flag, int bf, int upd_ctx)
 {
   int changed = h->changed;
@@ -263,6 +267,9 @@ void _mutt_set_flag (CONTEXT *ctx, HEADER *h, int flag, int bf, int upd_ctx)
    */
   if (h->searched && (changed != h->changed || deleted != ctx->deleted || tagged != ctx->tagged || flagged != ctx->flagged))
     h->searched = 0;
+#ifdef USE_SIDEBAR
+  sb_draw();
+#endif
 }
 
 void mutt_tag_set_flag (int flag, int bf)