[Bug tui/32614] [gdb/tui] resize triggers source window to change contents

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

https://sourceware.org/bugzilla/show_bug.cgi?id=32614

--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #0)
> It's also a question, before the resize, why main.c is displayed on a source
> window showing "[ No Source Available ]" for foo.c.

Using this patch:
...
diff --git a/gdb/tui/tui-winsource.c b/gdb/tui/tui-winsource.c
index a5d0c594545..5ddf0f73a34 100644
--- a/gdb/tui/tui-winsource.c
+++ b/gdb/tui/tui-winsource.c
@@ -220,8 +220,11 @@ void
 tui_source_window_base::do_erase_source_content (const char *str)
 {
   m_content.clear ();
+
   if (handle != nullptr)
     center_string (str);
+
+  set_title ("");
 }

 /* See tui-winsource.h.  */
...
I get instead:
...
┌────────────────────────────────────────────────┐
│                                                │
│                                                │
│                                                │
│            [ No Source Available ]             │
│                                                │
│                                                │
└────────────────────────────────────────────────┘
(src) In: foo                  L??   PC: 0x400566 
db.so.1".

Breakpoint 1, 0x0000000000400566 in foo ()
(gdb) 
...

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