⭐️ Impl: isInitialPresent

Summary: Impl. `RNIModalPresentationStateMachine.isInitialPresent`.

ios/src_library/React Native/RNIModal/RNIModalPresentationState.swift

@@ -145,11 +145,18 @@ public struct RNIModalPresentationStateMachine {
   // MARK: - Properties
   // ------------------
 
+  private var _isInitialPresent: Bool? = nil;
+
   public var wasCancelledDismissViaGesture: Bool = false;
 
+
   // MARK: - Computed Properties
   // ---------------------------
 
+  public var isInitialPresent: Bool {
+    self._isInitialPresent ?? true;
+  };
+
   public var isPresented: Bool {
     self.state.isPresented
   };
@@ -212,22 +219,31 @@ public struct RNIModalPresentationStateMachine {
       self.state = nextState;
     };
 
+    if nextState.isPresenting && self._isInitialPresent == nil {
+      self._isInitialPresent = true;
+
+    } else if nextState.isPresenting && self._isInitialPresent == true {
+      self._isInitialPresent = false;
+    };
+
+    self.resetIfNeeded();
+
     #if DEBUG
     print(
         "Log - RNIModalPresentationStateMachine.set"
       + " - statePrev: \(self.statePrev)"
       + " - nextState: \(self.state)"
       + " - wasCancelledDismissViaGesture: \(wasCancelledDismissViaGesture)"
+      + " - isInitialPresent: \(self.isInitialPresent)"
     );
     #endif
-
-    self.resetIfNeeded();
   };
 
   mutating func resetIfNeeded(){
     if self.state == .DISMISSED {
       // reset
       self.wasCancelledDismissViaGesture = false;
+      self._isInitialPresent = false;
     };
   };
 };