patch 9.1.0473: term_start() does not clear vertical modifier

Commit: 
https://github.com/vim/vim/commit/d603e956095b8bc79526476138fe80b1e0be9b8d
Author: Yegappan Lakshmanan <yegap...@yahoo.com>
Date:   Mon Jun 10 18:16:34 2024 +0200

    patch 9.1.0473: term_start() does not clear vertical modifier
    
    Problem:  term_start() does not clear vertical modifier
    Solution: Clear the flag after splitting the window
              (Yegappan Lakshmanan)
    
    closes: #14953
    
    Signed-off-by: Yegappan Lakshmanan <yegap...@yahoo.com>
    Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/src/terminal.c b/src/terminal.c
index 25a6a5dd7..28e1abfec 100644
--- a/src/terminal.c
+++ b/src/terminal.c
@@ -538,9 +538,15 @@ term_start(
            split_ea.addr_count = 1;
        }
 
+       int cmod_split_modified = FALSE;
        if (vertical)
+       {
            cmdmod.cmod_split |= WSP_VERT;
+           cmod_split_modified = TRUE;
+       }
        ex_splitview(&split_ea);
+       if (vertical && cmod_split_modified)
+           cmdmod.cmod_split &= ~WSP_VERT;
        if (curwin == old_curwin)
        {
            // split failed
diff --git a/src/testdir/test_terminal3.vim b/src/testdir/test_terminal3.vim
index 848e3fa47..3cca1b05c 100644
--- a/src/testdir/test_terminal3.vim
+++ b/src/testdir/test_terminal3.vim
@@ -10,6 +10,8 @@ source screendump.vim
 source mouse.vim
 source term_util.vim
 
+import './vim9.vim' as v9
+
 let $PROMPT_COMMAND=''
 
 func Test_terminal_altscreen()
@@ -959,4 +961,18 @@ func Test_terminal_vt420()
   call StopVimInTerminal(buf)
 endfunc
 
+" Test for using 'vertical' with term_start(). If a following term_start(),
+" doesn't have the 'vertical' attribute, then it should be split horizontally.
+func Test_terminal_vertical()
+  let lines =<< trim END
+    call term_start("NONE", {'vertical': 1})
+    call term_start("NONE")
+    VAR layout = winlayout()
+    call assert_equal('row', layout[0], string(layout))
+    call assert_equal('col', layout[1][0][0], string(layout))
+    :%bw!
+  END
+  call v9.CheckLegacyAndVim9Success(lines)
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab
diff --git a/src/version.c b/src/version.c
index 334ebd716..78668eaad 100644
--- a/src/version.c
+++ b/src/version.c
@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    473,
 /**/
     472,
 /**/

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