From 5600328d83b133dedb5c50a4b091cd81956feb8b Mon Sep 17 00:00:00 2001
From: Christian Prochaska <christian.prochaska@genode-labs.com>
Date: Fri, 22 Mar 2013 21:27:05 +0100
Subject: [PATCH] terminal_mux: Clear terminal when activating menu

This patch clears the terminal each time the menu appears and thereby
wipes away artifacts that might occur when combining terminal_mux with
kdb_uart_drv and the kernel prints messages directly.
---
 gems/src/server/terminal_mux/main.cc       | 1 +
 gems/src/server/terminal_mux/ncurses.cc    | 6 ++++++
 gems/src/server/terminal_mux/ncurses_cxx.h | 2 ++
 3 files changed, 9 insertions(+)

diff --git a/gems/src/server/terminal_mux/main.cc b/gems/src/server/terminal_mux/main.cc
index 79fc26300..7a000f8a4 100644
--- a/gems/src/server/terminal_mux/main.cc
+++ b/gems/src/server/terminal_mux/main.cc
@@ -610,6 +610,7 @@ void Session_manager::activate_menu()
 	_menu.reset_selection();
 	_registry.to_front(&_menu);
 	_status_window.label(_menu.label());
+	_ncurses.clear_ok();
 	_menu.flush_all();
 }
 
diff --git a/gems/src/server/terminal_mux/ncurses.cc b/gems/src/server/terminal_mux/ncurses.cc
index 65f858133..47e698294 100644
--- a/gems/src/server/terminal_mux/ncurses.cc
+++ b/gems/src/server/terminal_mux/ncurses.cc
@@ -66,6 +66,12 @@ Ncurses::Window *Ncurses::create_window(int x, int y, int w, int h)
 }
 
 
+void Ncurses::clear_ok()
+{
+	clearok(stdscr, true);
+}
+
+
 void Ncurses::do_update()
 {
 	doupdate();
diff --git a/gems/src/server/terminal_mux/ncurses_cxx.h b/gems/src/server/terminal_mux/ncurses_cxx.h
index 366a90adb..949784488 100644
--- a/gems/src/server/terminal_mux/ncurses_cxx.h
+++ b/gems/src/server/terminal_mux/ncurses_cxx.h
@@ -45,6 +45,8 @@ class Ncurses
 
 		Window *create_window(int x, int y, int w, int h);
 
+		void clear_ok();
+
 		void do_update();
 
 		Ncurses();