fix(input): fix composition mode in IE for Korean input

Fixes #6656
Closes #16273

Author: jileeon

src/ng/directive/input.js

@@ -1248,6 +1248,16 @@ function baseInputType(scope, element, attr, ctrl, $sniffer, $browser) {
       composing = true;
     });
 
+    // Support: IE9+
+    element.on('compositionupdate', function(ev) {
+      // End composition when ev.data is empty string on 'compositionupdate' event.
+      // When the input de-focusses (e.g. by clicking away), IE triggers 'compositionupdate'
+      // instead of 'compositionend'.
+      if (isUndefined(ev.data) || ev.data === '') {
+        composing = false;
+      }
+    });
+
     element.on('compositionend', function() {
       composing = false;
       listener();