From 0bbca540f7377889e2154aa5731f6eeffcb5c0cc Mon Sep 17 00:00:00 2001
From: Bram Moolenaar <Bram@vim.org>
Date: Tue, 11 Jan 2022 13:14:54 +0000
Subject: [PATCH] patch 8.2.4062: match highlighting of tab too short

Problem:    Match highlighting of tab too short.
Solution:   Do not stop match highlighting if on a Tab. (Christian Brabandt,
            closes #9507, closes #9500)
---
 src/drawline.c                                 |  5 +++--
 .../dumps/Test_match_tab_linebreak.dump        | 10 ++++++++++
 src/testdir/test_match.vim                     | 18 ++++++++++++++++++
 src/version.c                                  |  2 ++
 4 files changed, 33 insertions(+), 2 deletions(-)
 create mode 100644 src/testdir/dumps/Test_match_tab_linebreak.dump

diff --git a/src/drawline.c b/src/drawline.c
index 8a042ed3ea..1cf468137a 100644
--- a/src/drawline.c
+++ b/src/drawline.c
@@ -2043,9 +2043,10 @@ win_line(
 			if (n_extra < 0)
 			    n_extra = 0;
 		    }
-		    if (on_last_col)
+		    if (on_last_col && c != TAB)
 			// Do not continue search/match highlighting over the
-			// line break.
+			// line break, but for TABs the highlighting should
+			// include the complete width of the character
 			search_attr = 0;
 
 		    if (c == TAB && n_extra + col > wp->w_width)
diff --git a/src/testdir/dumps/Test_match_tab_linebreak.dump b/src/testdir/dumps/Test_match_tab_linebreak.dump
new file mode 100644
index 0000000000..9a525d1cf4
--- /dev/null
+++ b/src/testdir/dumps/Test_match_tab_linebreak.dump
@@ -0,0 +1,10 @@
+| +0#ffffff16#e000002@6> |i+0#0000000#ffffff0|x| @64
+|~+0#4040ff13&| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+| +0#0000000&@56|1|,|1|-|8| @8|A|l@1| 
diff --git a/src/testdir/test_match.vim b/src/testdir/test_match.vim
index 0af45a49a7..a912b78a12 100644
--- a/src/testdir/test_match.vim
+++ b/src/testdir/test_match.vim
@@ -407,4 +407,22 @@ func Test_matchdelete_redraw()
   bw!
 endfunc
 
+func Test_match_tab_with_linebreak()
+  CheckRunVimInTerminal
+
+  let lines =<< trim END
+    set linebreak
+    call setline(1, "\tix")
+    call matchadd('ErrorMsg', '\t')
+  END
+  call writefile(lines, 'XscriptMatchTabLinebreak')
+  let buf = RunVimInTerminal('-S XscriptMatchTabLinebreak', #{rows: 10})
+  call TermWait(buf)
+  call VerifyScreenDump(buf, 'Test_match_tab_linebreak', {})
+
+  call StopVimInTerminal(buf)
+  call delete('XscriptMatchTabLinebreak')
+endfunc
+
+
 " vim: shiftwidth=2 sts=2 expandtab
diff --git a/src/version.c b/src/version.c
index 3fe45ea4c4..36525af3db 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 */
+/**/
+    4062,
 /**/
     4061,
 /**/