Revert "added a textSelectionColor property to fix [Feature Request] More UI customisation options #1431"

This reverts commit 7cfa8afb8f.

lib/src/widgets/editor.dart

@@ -1,4 +1,5 @@
 import 'dart:math' as math;
+
 // ignore: unnecessary_import
 import 'dart:typed_data';
 
@@ -192,7 +193,6 @@ class QuillEditor extends StatefulWidget {
     this.contentInsertionConfiguration,
     this.contextMenuBuilder,
     this.editorKey,
-    this.textSelectionColor,
     Key? key,
   }) : super(key: key);
 
@@ -455,11 +455,6 @@ class QuillEditor extends StatefulWidget {
   /// editorKey.currentState?.renderEditor.getLocalRectForCaret
   final GlobalKey<EditorState>? editorKey;
 
-  /// Allows for providing a custom text selection color.
-  ///
-  /// Defaults to Material selectionTheme or primary color.
-  final Color? textSelectionColor;
-
   @override
   QuillEditorState createState() => QuillEditorState();
 }
@@ -498,8 +493,7 @@ class QuillEditorState extends State<QuillEditor>
       paintCursorAboveText = true;
       cursorOpacityAnimates = true;
       cursorColor ??= selectionTheme.cursorColor ?? cupertinoTheme.primaryColor;
-      selectionColor = widget.textSelectionColor ??
-          selectionTheme.selectionColor ??
+      selectionColor = selectionTheme.selectionColor ??
           cupertinoTheme.primaryColor.withOpacity(0.40);
       cursorRadius ??= const Radius.circular(2);
       cursorOffset = Offset(
@@ -509,8 +503,7 @@ class QuillEditorState extends State<QuillEditor>
       paintCursorAboveText = false;
       cursorOpacityAnimates = false;
       cursorColor ??= selectionTheme.cursorColor ?? theme.colorScheme.primary;
-      selectionColor = widget.textSelectionColor ??
-          selectionTheme.selectionColor ??
+      selectionColor = selectionTheme.selectionColor ??
           theme.colorScheme.primary.withOpacity(0.40);
     }