From d74fdb6edbedbb184de9a8230e156460cb609aa6 Mon Sep 17 00:00:00 2001
From: Roger Peppe <rogpeppe@gmail.com>
Date: Wed, 17 Jul 2013 17:55:09 +0100
Subject: cmd/devdraw: clear keyboard state on lost focus.

See https://bitbucket.org/rsc/plan9port/issue/128/alt-button-sticks-in-acme-sometimes-after

R=rsc
https://codereview.appspot.com/11453043
---
 CONTRIBUTORS              | 1 +
 src/cmd/devdraw/x11-srv.c | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index 73171a95..c49c9cdb 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -40,6 +40,7 @@ Peter Saveliev <svinota.saveliev@gmail.com>
 Richard Miller <millerresearch@gmail.com>
 Rob Kroeger <robkroeger@gmail.com>
 Rob Pike <robpike@gmail.com>
+Roger Peppe <rogpeppe@gmail.com>
 Russ Cox <rsc@swtch.com>
 Sean McKean <smckean83@gmail.com>
 Shenghou Ma <minux.ma@gmail.com>
diff --git a/src/cmd/devdraw/x11-srv.c b/src/cmd/devdraw/x11-srv.c
index 04ecabee..b9343913 100644
--- a/src/cmd/devdraw/x11-srv.c
+++ b/src/cmd/devdraw/x11-srv.c
@@ -619,6 +619,12 @@ runxevent(XEvent *xev)
 		break;
 	
 	case FocusOut:
+		/*
+		 * Some key combinations (e.g. Alt-Tab) can cause us
+		 * to see the key down event without the key up event,
+		 * so clear out the keyboard state when we lose the focus.
+		 */
+		kstate = 0;
 		abortcompose();
 		break;
 	
-- 
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