2 files changed, 24 insertions, 2 deletions
diff --git a/src/nvim/plines.c b/src/nvim/plines.c
index 42218ac847..bed15f9e36 100644
--- a/src/nvim/plines.c
+++ b/src/nvim/plines.c
@@ -444,9 +444,9 @@ int win_lbr_chartabsize(chartabsize_T *cts, int *headp)
   // May have to add something for 'breakindent' and/or 'showbreak'
   // string at start of line.
   // Set *headp to the size of what we add.
+  // Do not use 'showbreak' at the NUL after the text.
   added = 0;
-
-  char *const sbr = (char *)get_showbreak_value(wp);
+  char *const sbr = c == NUL ? empty_option : (char *)get_showbreak_value(wp);
   if ((*sbr != NUL || wp->w_p_bri) && wp->w_p_wrap && vcol != 0) {
     colnr_T sbrlen = 0;
     int numberwidth = win_col_off(wp);
diff --git a/src/nvim/testdir/test_breakindent.vim b/src/nvim/testdir/test_breakindent.vim
index 8bbac2d237..934dca4793 100644
--- a/src/nvim/testdir/test_breakindent.vim
+++ b/src/nvim/testdir/test_breakindent.vim
@@ -8,6 +8,7 @@ source check.vim
 CheckOption breakindent
 
 source view_util.vim
+source screendump.vim
 
 let s:input ="\tabcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOP"
 
@@ -889,6 +890,27 @@ func Test_window_resize_with_linebreak()
   %bw!
 endfunc
 
+func Test_cursor_position_with_showbreak()
+  CheckScreendump
+
+  let lines =<< trim END
+      vim9script
+      &signcolumn = 'yes'
+      &showbreak = '+ '
+      var leftcol: number = win_getid()->getwininfo()->get(0, {})->get('textoff')
+      repeat('x', &columns - leftcol - 1)->setline(1)
+      'second line'->setline(2)
+  END
+  call writefile(lines, 'XscriptShowbreak')
+  let buf = RunVimInTerminal('-S XscriptShowbreak', #{rows: 6})
+
+  call term_sendkeys(buf, "AX")
+  call VerifyScreenDump(buf, 'Test_cursor_position_with_showbreak', {})
+
+  call StopVimInTerminal(buf)
+  call delete('XscriptShowbreak')
+endfunc
+
 func Test_no_spurious_match()
   let s:input = printf('- y %s y %s', repeat('x', 50), repeat('x', 50))
   call s:test_windows('setl breakindent breakindentopt=list:-1 formatlistpat=^- hls')