get pixel ratio from view (singerdmx#1259)

Author: foreverpw

lib/src/widgets/editor.dart

@@ -477,8 +477,8 @@ class QuillEditorState extends State<QuillEditor>
       selectionColor = selectionTheme.selectionColor ??
           cupertinoTheme.primaryColor.withOpacity(0.40);
       cursorRadius ??= const Radius.circular(2);
-      cursorOffset = Offset(
-          iOSHorizontalOffset / MediaQuery.of(context).devicePixelRatio, 0);
+      cursorOffset =
+          Offset(iOSHorizontalOffset / View.of(context).devicePixelRatio, 0);
     } else {
       textSelectionControls = materialTextSelectionControls;
       paintCursorAboveText = false;

lib/src/widgets/raw_editor.dart

@@ -968,7 +968,7 @@ class RawEditorState extends EditorState
         widget.selectionColor,
         widget.enableInteractiveSelection,
         _hasFocus,
-        MediaQuery.of(context).devicePixelRatio,
+        View.of(context).devicePixelRatio,
         _cursorCont);
     return editableTextLine;
   }

lib/src/widgets/text_block.dart

@@ -159,7 +159,7 @@ class EditableTextBlock extends StatelessWidget {
           color,
           enableInteractiveSelection,
           hasFocus,
-          MediaQuery.of(context).devicePixelRatio,
+          View.of(context).devicePixelRatio,
           cursorCont);
       final nodeTextDirection = getDirectionOfNode(line);
       children.add(Directionality(