Fix TextInput stack overflow when pasting text in multiline input with maxlength

Summary: When pasting text longer than maxlenght, the textDidChange: call we did would end calling back into textView:shouldChange: because we saw an unexpected multi-character change. Since this is an expected mutation, update predictedText appropriately.

Reviewed By: majak

Differential Revision: D3561524

fbshipit-source-id: 07bb78d830ccfa3aed6ee274dc30adeadce9e1f8

Examples/UIExplorer/js/TextInputExample.ios.js

@@ -679,6 +679,12 @@ exports.examples = [
             keyboardType="url"
             style={[styles.multiline, styles.multilineWithFontStyles]}
           />
+          <TextInput
+            placeholder="multiline text input with max length"
+            maxLength={5}
+            multiline={true}
+            style={styles.multiline}
+          />
           <TextInput
             placeholder="uneditable multiline text input"
             editable={false}