Calling Paper TextInput setTextAndSelection view command now dirties layout

Summary:
Changelog: [Internal]

Previously `setTextAndSelection` was not dirtying layout. This would cause an issue where `setTextAndSelection` causes layout change. For example calling setTextAndSelection with empty string on a multiline auto expanding text input.

I changed one example in TextInputSharedExamples.js, "Live Re-Write (no spaces allowed) and clear" example is now multiline. This allows to test whether `setTextAndSelection` dirties layout. Enter multiline string to to the example text input and press clear. Observe that the text input shrinks to single line height.

Reviewed By: shergin

Differential Revision: D21182990

fbshipit-source-id: de8501ea0b97012cf4cdf8d5f658649139f92da6

Libraries/Text/TextInput/RCTBaseTextInputView.h

@@ -40,6 +40,7 @@ NS_ASSUME_NONNULL_BEGIN
 @property (nonatomic, copy, nullable) RCTDirectEventBlock onScroll;
 
 @property (nonatomic, assign) NSInteger mostRecentEventCount;
+@property (nonatomic, assign, readonly) NSInteger nativeEventCount;
 @property (nonatomic, assign) BOOL autoFocus;
 @property (nonatomic, assign) BOOL blurOnSubmit;
 @property (nonatomic, assign) BOOL selectTextOnFocus;
@@ -51,9 +52,11 @@ NS_ASSUME_NONNULL_BEGIN
 @property (nonatomic, copy) NSString *inputAccessoryViewID;
 @property (nonatomic, assign) UIKeyboardType keyboardType;
 
-- (void)setText:(NSString *__nullable)text
- selectionStart:(NSInteger)start
-   selectionEnd:(NSInteger)end;
+/**
+ Sets selection intext input if both start and end are within range of the text input.
+ **/
+- (void)setSelectionStart:(NSInteger)start
+             selectionEnd:(NSInteger)end;
 
 @end