BeforeInputEventPlugin: Support Opera <= 12

Add support for Opera <= 12 (Presto) in `BeforeInputEventPlugin`. It turns out that Opera 12 has a `TextEvent` in `window`, but doesn't actually fire any input events. Even `input` apparently doesn't fire. Fall back to keypress handling in this case.

Author: Isaac Salier-Hellendag

src/browser/eventPlugins/BeforeInputEventPlugin.js

@@ -29,9 +29,22 @@ var keyOf = require('keyOf');
 var canUseTextInputEvent = (
  ExecutionEnvironment.canUseDOM &&
  'TextEvent' in window &&
- !('documentMode' in document)
+ !('documentMode' in document || isPresto())
 );
 
+/**
+ * Opera <= 12 includes TextEvent in window, but does not fire
+ * text input events. Rely on keypress instead.
+ */
+function isPresto() {
+ var opera = window.opera;
+ return (
+ typeof opera === 'object' &&
+ typeof opera.version === 'function' &&
+ parseInt(opera.version(), 10) <= 12
+ );
+}
+
 var SPACEBAR_CODE = 32;
 var SPACEBAR_CHAR = String.fromCharCode(SPACEBAR_CODE);