[binutils-gdb] Don't call erase_data_content from tui_data_window::show_registers

[gdb-buildbot@sergiodj.net]

*** TEST RESULTS FOR COMMIT a31bff9d2d78d0d45e3e75dd2513ccbf480a7bc4 ***

commit a31bff9d2d78d0d45e3e75dd2513ccbf480a7bc4
Author:     Tom Tromey <tom@tromey.com>
AuthorDate: Tue Oct 1 17:42:17 2019 -0600
Commit:     Tom Tromey <tom@tromey.com>
CommitDate: Wed Oct 9 16:50:36 2019 -0600

    Don't call erase_data_content from tui_data_window::show_registers
    
    tui_data_window::show_registers currently calls erase_data_content.
    However, I think it's better to have fewer calls to this (ideally just
    one would suffice).  This refactors that function to remove this call.
    
    gdb/ChangeLog
    2019-10-09  Tom Tromey  <tom@tromey.com>
    
            * tui/tui-regs.c (tui_data_window::show_registers): Don't call
            erase_data_content.

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index bca7b7b4ff..a5504a9c00 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2019-10-09  Tom Tromey  <tom@tromey.com>
+
+	* tui/tui-regs.c (tui_data_window::show_registers): Don't call
+	erase_data_content.
+
 2019-10-09  Tom Tromey  <tom@tromey.com>
 
 	* tui/tui-wingeneral.h (tui_delete_win): Don't declare.
diff --git a/gdb/tui/tui-regs.c b/gdb/tui/tui-regs.c
index 474b62e204..1d936f712b 100644
--- a/gdb/tui/tui-regs.c
+++ b/gdb/tui/tui-regs.c
@@ -154,13 +154,14 @@ tui_data_window::show_registers (struct reggroup *group)
       for (auto &&data_item_win : m_regs_content)
 	data_item_win.highlight = false;
       m_current_group = group;
-      rerender ();
     }
   else
     {
       m_current_group = 0;
-      erase_data_content (_("[ Register Values Unavailable ]"));
+      m_regs_content.clear ();
     }
+
+  rerender ();
 }