Fix null safety errors on text_selection.dart

lib/widgets/raw_editor.dart

@@ -115,14 +115,9 @@ class RawEditorState extends EditorState
   late KeyboardListener _keyboardListener;
   bool _didAutoFocus = false;
   bool _keyboardVisible = false;
-<<<<<<< HEAD
   DefaultStyles? _styles;
-  final ClipboardStatusNotifier _clipboardStatus = ClipboardStatusNotifier();
-=======
-  DefaultStyles _styles;
-  final ClipboardStatusNotifier _clipboardStatus =
+  final ClipboardStatusNotifier? _clipboardStatus =
       kIsWeb ? null : ClipboardStatusNotifier();
->>>>>>> dda5805935568d42b71a1a1faf7fbdf078d72633
   final LayerLink _toolbarLayerLink = LayerLink();
   final LayerLink _startHandleLayerLink = LayerLink();
   final LayerLink _endHandleLayerLink = LayerLink();
@@ -681,7 +676,7 @@ class RawEditorState extends EditorState
   void initState() {
     super.initState();
 
-    _clipboardStatus.addListener(_onChangedClipboardStatus);
+    _clipboardStatus?.addListener(_onChangedClipboardStatus);
 
     widget.controller.addListener(_didChangeTextEditingValue);
 
@@ -873,7 +868,7 @@ class RawEditorState extends EditorState
   @override
   void dispose() {
     closeConnectionIfNeeded();
-    _keyboardVisibilitySubscription?.cancel();
+    _keyboardVisibilitySubscription.cancel();
     assert(!hasConnection);
     _selectionOverlay?.dispose();
     _selectionOverlay = null;
@@ -881,8 +876,8 @@ class RawEditorState extends EditorState
     widget.focusNode.removeListener(_handleFocusChanged);
     _focusAttachment!.detach();
     _cursorCont.dispose();
-    _clipboardStatus.removeListener(_onChangedClipboardStatus);
-    _clipboardStatus.dispose();
+    _clipboardStatus?.removeListener(_onChangedClipboardStatus);
+    _clipboardStatus?.dispose();
     super.dispose();
   }
 
@@ -948,7 +943,8 @@ class RawEditorState extends EditorState
         this,
         DragStartBehavior.start,
         null,
-          _clipboardStatus);
+        _clipboardStatus!,
+      );
       _selectionOverlay!.handlesVisible = _shouldShowSelectionHandles();
       _selectionOverlay!.showHandles();
     }
@@ -1098,9 +1094,7 @@ class RawEditorState extends EditorState
 
   @override
   bool showToolbar() {
-<<<<<<< HEAD
     if (_selectionOverlay == null || _selectionOverlay!.toolbar != null) {
-=======
       // Web is using native dom elements to enable clipboard functionality of the
       // toolbar: copy, paste, select, cut. It might also provide additional
       // functionality depending on the browser (such as translate). Due to this
@@ -1109,14 +1103,15 @@ class RawEditorState extends EditorState
         return false;
       }
 
-    if (_selectionOverlay == null || _selectionOverlay.toolbar != null) {
->>>>>>> dda5805935568d42b71a1a1faf7fbdf078d72633
+      if (_selectionOverlay == null || _selectionOverlay!.toolbar != null) {
         return false;
       }
 
       _selectionOverlay!.showToolbar();
       return true;
     }
+    return true;
+  }
 
   @override
   bool get wantKeepAlive => widget.focusNode.hasFocus;