Fix cursor position in new line after blockquote

apple/MarkdownBackedTextInputDelegate.h

@@ -0,0 +1,12 @@
+#import <React/RCTBackedTextInputDelegate.h>
+#import <React/RCTUITextView.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface MarkdownBackedTextInputDelegate : NSObject <RCTBackedTextInputDelegate>
+
+- (instancetype)initWithTextView:(RCTUITextView *)textView;
+
+@end
+
+NS_ASSUME_NONNULL_END

apple/MarkdownBackedTextInputDelegate.mm

@@ -0,0 +1,76 @@
+#import "MarkdownBackedTextInputDelegate.h"
+
+@implementation MarkdownBackedTextInputDelegate {
+  __weak RCTUITextView *_textView;
+  id<RCTBackedTextInputDelegate> _originalTextInputDelegate;
+}
+
+- (instancetype)initWithTextView:(RCTUITextView *)textView
+{
+  if (self = [super init]) {
+    _textView = textView;
+    _originalTextInputDelegate = _textView.textInputDelegate;
+    _textView.textInputDelegate = self;
+  }
+  return self;
+}
+
+- (void)dealloc
+{
+  // Restore original text input delegate
+  _textView.textInputDelegate = _originalTextInputDelegate;
+}
+
+- (void)textInputDidChange
+{
+  // After adding a newline at the end of the blockquote, the typing attributes in the new line
+  // still contain NSParagraphStyle with non-zero firstLineHeadIndent and headIntent.
+  // This causes the cursor to be shifted to the right instead of being located at the beginning of the line.
+  // The following code removes NSParagraphStyle from typing attributes to fix the position of the cursor.
+  NSMutableDictionary *typingAttributes = [_textView.typingAttributes mutableCopy];
+  [typingAttributes removeObjectForKey:NSParagraphStyleAttributeName];
+  _textView.typingAttributes = typingAttributes;
+
+  // Delegate the call to the original text input delegate
+  [_originalTextInputDelegate textInputDidChange];
+}
+
+// Delegate all remaining calls to the original text input delegate
+
+- (void)textInputDidBeginEditing {
+  [_originalTextInputDelegate textInputDidBeginEditing];
+}
+
+- (void)textInputDidChangeSelection { 
+  [_originalTextInputDelegate textInputDidChangeSelection];
+}
+
+- (void)textInputDidEndEditing { 
+  [_originalTextInputDelegate textInputDidEndEditing];
+}
+
+- (void)textInputDidReturn { 
+  [_originalTextInputDelegate textInputDidReturn];
+}
+
+- (BOOL)textInputShouldBeginEditing { 
+  return [_originalTextInputDelegate textInputShouldBeginEditing];
+}
+
+- (nonnull NSString *)textInputShouldChangeText:(nonnull NSString *)text inRange:(NSRange)range { 
+  return [_originalTextInputDelegate textInputShouldChangeText:text inRange:range];
+}
+
+- (BOOL)textInputShouldEndEditing {
+  return [_originalTextInputDelegate textInputShouldEndEditing];
+}
+
+- (BOOL)textInputShouldReturn {
+  return [_originalTextInputDelegate textInputShouldReturn];
+}
+
+- (BOOL)textInputShouldSubmitOnReturn {
+  return [_originalTextInputDelegate textInputShouldSubmitOnReturn];
+}
+
+@end

apple/MarkdownTextInputDecoratorView.mm

@@ -8,6 +8,7 @@
 #import <React/RCTBaseTextInputView.h>
 #endif
 
+#import <RNLiveMarkdown/MarkdownBackedTextInputDelegate.h>
 #import <RNLiveMarkdown/MarkdownLayoutManager.h>
 #import <RNLiveMarkdown/MarkdownTextInputDecoratorView.h>
 #import <RNLiveMarkdown/MarkdownTextStorageDelegate.h>
@@ -18,6 +19,7 @@
 @implementation MarkdownTextInputDecoratorView {
   RCTMarkdownUtils *_markdownUtils;
   RCTMarkdownStyle *_markdownStyle;
+  MarkdownBackedTextInputDelegate *_markdownBackedTextInputDelegate;
   MarkdownTextStorageDelegate *_markdownTextStorageDelegate;
   MarkdownTextFieldObserver *_markdownTextFieldObserver;
   __weak RCTUITextView *_textView;
@@ -86,6 +88,9 @@ - (void)didMoveToWindow {
     _markdownTextStorageDelegate = [[MarkdownTextStorageDelegate alloc] initWithTextView:_textView markdownUtils:_markdownUtils];
     _textView.textStorage.delegate = _markdownTextStorageDelegate;
 
+    // register delegate for fixing cursor position
+    _markdownBackedTextInputDelegate = [[MarkdownBackedTextInputDelegate alloc] initWithTextView:_textView];
+
 #ifdef RCT_NEW_ARCH_ENABLED
     // format initial value
     [_textView.textStorage setAttributedString:_textView.attributedText];
@@ -117,6 +122,7 @@ - (void)willMoveToWindow:(UIWindow *)newWindow
       [_textView.layoutManager setValue:nil forKey:@"markdownUtils"];
       object_setClass(_textView.layoutManager, [NSLayoutManager class]);
     }
+    _markdownBackedTextInputDelegate = nil;
     _markdownTextStorageDelegate = nil;
     _textView.textStorage.delegate = nil;
     _textView = nil;