fix input cursor bug in chrome

tests/input-cursor.html

@@ -0,0 +1,38 @@
+<p>Typing in the fields below should not move the cursor to the end of the input. Especially in Chrome</p>
+<p>All inputs should update with the same value</p>
+<p>Typing in an input should not prevent it from being updated by other inputs</p>
+<div id="test"></div>
+<script src="../mithril.js"></script>
+<script>
+var app = {}
+
+app.controller = function() {
+	this.title = m.prop("hello world");
+}
+
+app.view = function(ctrl) {
+	return	m("body", [
+		m("h1", ["Title: ", ctrl.title()]),
+		m("input", {
+		onkeyup: m.withAttr("value", ctrl.title),
+			value: ctrl.title()
+		}),
+	m("br"),
+		m("textarea", {
+			onkeyup: m.withAttr("value", ctrl.title),
+			value: ctrl.title()
+		}),
+	m("br"),
+		m("textarea", {
+			onkeyup: m.withAttr("value", ctrl.title)
+		}, ctrl.title()),
+	m("br"),
+		m("div[contenteditable]", {
+			style: {border: "1px solid #888"},
+			onkeyup: m.withAttr("innerHTML", ctrl.title)
+		}, ctrl.title()),
+	]);
+}
+
+m.module(document.getElementById("test"), app);
+</script>