From 7d42840033aedf36389208b62e28b4e0b251c199 Mon Sep 17 00:00:00 2001
From: James Cherti <60946298+jamescherti@users.noreply.github.com>
Date: Mon, 14 Mar 2022 20:24:51 +0000
Subject: [PATCH] patch 8.2.4566: check for existing buffer in session file may
 not work

Problem:    Check for existing buffer in session file does not work for files
            in the home directory.
Solution:   Use fnamemodify(). (James Cherti, closes #9945)  Add a test.
---
 src/session.c                  | 4 ++--
 src/testdir/test_mksession.vim | 5 +++++
 src/version.c                  | 2 ++
 3 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/session.c b/src/session.c
index 68e40db80d..fa77f89c8e 100644
--- a/src/session.c
+++ b/src/session.c
@@ -385,9 +385,9 @@ put_view(
 	    // Note, if a buffer for that file already exists, use :badd to
 	    // edit that buffer, to not lose folding information (:edit resets
 	    // folds in other buffers)
-	    if (fputs("if bufexists(\"", fd) < 0
+	    if (fputs("if bufexists(fnamemodify(\"", fd) < 0
 		    || ses_fname(fd, wp->w_buffer, flagp, FALSE) == FAIL
-		    || fputs("\") | buffer ", fd) < 0
+		    || fputs("\", \":p\")) | buffer ", fd) < 0
 		    || ses_fname(fd, wp->w_buffer, flagp, FALSE) == FAIL
 		    || fputs(" | else | edit ", fd) < 0
 		    || ses_fname(fd, wp->w_buffer, flagp, FALSE) == FAIL
diff --git a/src/testdir/test_mksession.vim b/src/testdir/test_mksession.vim
index 494ac873bb..2c2737e006 100644
--- a/src/testdir/test_mksession.vim
+++ b/src/testdir/test_mksession.vim
@@ -245,6 +245,7 @@ func Test_mksession_one_buffer_two_windows()
   let count1 = 0
   let count2 = 0
   let count2buf = 0
+  let bufexists = 0
   for line in lines
     if line =~ 'edit \f*Xtest1$'
       let count1 += 1
@@ -255,10 +256,14 @@ func Test_mksession_one_buffer_two_windows()
     if line =~ 'buffer \f\{-}Xtest2'
       let count2buf += 1
     endif
+    if line =~ 'bufexists(fnamemodify(.*, ":p")'
+      let bufexists += 1
+    endif
   endfor
   call assert_equal(1, count1, 'Xtest1 count')
   call assert_equal(2, count2, 'Xtest2 count')
   call assert_equal(2, count2buf, 'Xtest2 buffer count')
+  call assert_equal(2, bufexists)
 
   close
   bwipe!
diff --git a/src/version.c b/src/version.c
index 2ea5965cdc..5576f20f9a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4566,
 /**/
     4565,
 /**/