fix(input[text]): composing function dosen't works properly in IE

Author: jileeon

src/ng/directive/input.js

@@ -1248,6 +1248,12 @@ function baseInputType(scope, element, attr, ctrl, $sniffer, $browser) {
       composing = true;
     });
 
+    element.on('compositionupdate', function(ev) {
+      // To end composition when ev.data is empty string on 'compositionupdate' event.
+      // When the input has blurred, IE only triggers 'compositionupdate' event instead of 'compositionend'.
+      if (ev.data === '') composing = false;
+    });
+
     element.on('compositionend', function() {
       composing = false;
       listener();