[Bug tui/28482] [tui] nexting through hello world results in duplicate lines in source window

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=28482

--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
I switched off the reverse mode point highlighting:
...
diff --git a/gdb/tui/tui-winsource.c b/gdb/tui/tui-winsource.c
index afd51e95980..f0bf76b15be 100644
--- a/gdb/tui/tui-winsource.c
+++ b/gdb/tui/tui-winsource.c
@@ -239,13 +239,17 @@ tui_source_window_base::show_source_line (int lineno)
   struct tui_source_element *line;

   line = &m_content[lineno];
+#if 0
   if (line->is_exec_point)
     tui_set_reverse_mode (m_pad.get (), true);
+#endif

   wmove (m_pad.get (), lineno, 0);
   tui_puts (line->line.c_str (), m_pad.get ());
+#if 0
   if (line->is_exec_point)
     tui_set_reverse_mode (m_pad.get (), false);
+#endif
 }

 /* See tui-winsource.h.  */
...
and got instead:
...
     6  {
     7    void *p = malloc (10);
>    8    printf ("hello: %p\n", p);
     9    return 0;
>   10  }
...
which fixes the duplicate line, but the old '>' marker is left, and the new one
is in the wrong place.  After another next, we have:
...
     6  {
     7    void *p = malloc (10);
>    8    printf ("hello: %p\n", p);
     9    return 0;
    10  }
>   11
...

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