Fix #4358: RichTextEditor Provider Abstraction.

Oqtane.Client/Modules/Controls/TextAreaTextEditor.razor

@@ -0,0 +1,31 @@
+@namespace Oqtane.Modules.Controls
+@inherits ModuleControlBase
+@implements ITextEditor
+
+<div class="text-area-editor">
+    <textarea @bind="_content" @ref="_editor" placeholder="@Placeholder" readonly="@ReadOnly" />
+</div>
+
+@code {
+    private ElementReference _editor;
+    private string _content;
+
+    [Parameter]
+    public bool ReadOnly { get; set; }
+
+    [Parameter]
+    public string Placeholder { get; set; }
+
+    public void Initialize(string content)
+    {
+        _content = content;
+
+        StateHasChanged();
+    }
+
+    public async Task<string> GetContent()
+    {
+        await Task.CompletedTask;
+        return _content;
+    }
+}