fix: state change emitting with default values improvement (#251)

Fixes:
#237
Turns out `eventEmitter` isn't available from the very beginning, but
the iOS code was remembering recently active styles even if no state
change event was emitted. This way, when the event emitter was finally
available, no state change event was emitted because recently active
styles were exactly same (even though no event went out).
Except that, I added all lifecycle callbacks
(`anyTextMayHaveBeenModified` that e.g. runs the state change event) to
the `didMoveToWindow` because it seems like the event emitter is defined
then.
The issue was;`defaultValue` was set but its state changes emitted only
when some change was done to an input (and not on focus or when
eventEmitter is available). The PR fixes both scenarios.

---------

Co-authored-by: Igor Furgała <74370735+exploIF@users.noreply.github.com>

Author: szydlovsky

ios/EnrichedTextInputView.mm

@@ -601,6 +601,9 @@ - (void)tryUpdatingActiveStyles {
   // style updates are emitted only if something differs from the previously active styles
   BOOL updateNeeded = NO;
 
+  // active styles are kept in a separate set until we're sure they can be emitted
+  NSMutableSet *newActiveStyles = [_activeStyles mutableCopy];
+  
   // data for onLinkDetected event
   LinkData *detectedLinkData;
   NSRange detectedLinkRange = NSMakeRange(0, 0);
@@ -611,14 +614,14 @@ - (void)tryUpdatingActiveStyles {
 
   for (NSNumber* type in stylesDict) {
     id<BaseStyleProtocol> style = stylesDict[type];
-    BOOL wasActive = [_activeStyles containsObject: type];
+    BOOL wasActive = [newActiveStyles containsObject: type];
     BOOL isActive = [style detectStyle:textView.selectedRange];
     if(wasActive != isActive) {
       updateNeeded = YES;
       if(isActive) {
-        [_activeStyles addObject:type];
+        [newActiveStyles addObject:type];
       } else {
-        [_activeStyles removeObject:type];
+        [newActiveStyles removeObject:type];
       }
     }
 
@@ -678,6 +681,9 @@ - (void)tryUpdatingActiveStyles {
   if(updateNeeded) {
     auto emitter = [self getEventEmitter];
     if(emitter != nullptr) {
+      // update activeStyles only if emitter is available
+      _activeStyles = newActiveStyles;
+      
       emitter->onChangeState({
         .isBold = [_activeStyles containsObject: @([BoldStyle getStyleType])],
         .isItalic = [_activeStyles containsObject: @([ItalicStyle getStyleType])],
@@ -990,6 +996,9 @@ - (void)manageSelectionBasedChanges {
       textView.typingAttributes = defaultTypingAttributes;
     }
   }
+  
+  // update active styles as well
+  [self tryUpdatingActiveStyles];
 }
 
 - (void)handleWordModificationBasedChanges:(NSString*)word inRange:(NSRange)range {
@@ -1105,17 +1114,18 @@ - (void)_performRelayout
   if (!textView) { return; }
 
   dispatch_async(dispatch_get_main_queue(), ^{
-    NSRange wholeRange = NSMakeRange(0, textView.textStorage.string.length);
+    NSRange wholeRange = NSMakeRange(0, self->textView.textStorage.string.length);
     NSRange actualRange = NSMakeRange(0, 0);
-    [textView.layoutManager invalidateLayoutForCharacterRange:wholeRange actualCharacterRange:&actualRange];
-    [textView.layoutManager ensureLayoutForCharacterRange:actualRange];
-    [textView.layoutManager invalidateDisplayForCharacterRange:wholeRange];
+    [self->textView.layoutManager invalidateLayoutForCharacterRange:wholeRange actualCharacterRange:&actualRange];
+    [self->textView.layoutManager ensureLayoutForCharacterRange:actualRange];
+    [self->textView.layoutManager invalidateDisplayForCharacterRange:wholeRange];
   });
 }
 
 - (void)didMoveToWindow {
   [super didMoveToWindow];
-  [self scheduleRelayoutIfNeeded];
+  // used to run all lifecycle callbacks
+  [self anyTextMayHaveBeenModified];
 }
 
 // MARK: - UITextView delegate methods
@@ -1200,9 +1210,6 @@ - (void)textViewDidChangeSelection:(UITextView *)textView {
 
   // manage selection changes
   [self manageSelectionBasedChanges];
-  
-  // update active styles
-  [self tryUpdatingActiveStyles];
 }
 
 // this function isn't called always when some text changes (for example setting link or starting mention with indicator doesn't fire it)