[Dialog] Fix regression, see details in microsoft#2542 (microsoft#2568)

* Fix microsoft#2542 by not including Instance.ontent in hash code method.

* Fix issue by adding Visible to DialogParameters. Dialog Hide/Show methods will now set Visible value. Provider will only render dialog if Visible is true.

examples/Demo/Shared/Microsoft.FluentUI.AspNetCore.Components.xml

@@ -3333,6 +3333,11 @@
             outside the dialog. Defaults to false.
             </summary>
         </member>
+        <member name="P:Microsoft.FluentUI.AspNetCore.Components.DialogParameters.Visible">
+            <summary>
+            Gets or sets if a dialog is visible or nt (Hidden)
+            </summary>
+        </member>
         <member name="P:Microsoft.FluentUI.AspNetCore.Components.DialogParameters.PreventScroll">
             <summary>
             Prevents scrolling outside of the dialog while it is shown.

src/Core/Components/Dialog/FluentDialog.razor.cs

@@ -165,6 +165,7 @@ protected override async Task OnAfterRenderAsync(bool firstRender)
     public void Show()
     {
         Hidden = false;
+        Instance.Parameters.Visible = true;
         RefreshHeaderFooter();
     }
 
@@ -174,7 +175,8 @@ public void Show()
     public void Hide()
     {
         Hidden = true;
-        RefreshHeaderFooter();
+        Instance.Parameters.Visible = false;
+        //RefreshHeaderFooter();
     }
 
     /// <summary>

src/Core/Components/Dialog/FluentDialogProvider.razor

@@ -14,7 +14,10 @@
     {
         @foreach (DialogReference dialog in _internalDialogContext.References)
         {
-            <FluentDialog @key="@dialog.GetKey()" Id="@dialog.Id" Instance="@dialog.Instance" Data="@dialog.Instance.Content" @ondialogdismiss=OnDismissAsync />
+            if (dialog.Instance.Parameters.Visible)
+            {
+                <FluentDialog @key="@dialog.GetKey()" Id="@dialog.Id" Instance="@dialog.Instance" Data="@dialog.Instance.Content" @ondialogdismiss=OnDismissAsync />
+            }
         }
     }
 }

src/Core/Components/Dialog/Parameters/DialogParameters.cs

@@ -30,6 +30,11 @@ public class DialogParameters : ComponentParameters, IDialogParameters
     /// </summary>
     public bool PreventDismissOnOverlayClick { get; set; } = false;
 
+    /// <summary>
+    /// Gets or sets if a dialog is visible or not (Hidden)
+    /// </summary>
+    public bool Visible { get; set; } = true;
+
     /// <summary>
     /// Prevents scrolling outside of the dialog while it is shown.
     /// </summary>to use
@@ -87,7 +92,7 @@ public class DialogParameters : ComponentParameters, IDialogParameters
     /// <summary>
     /// Gets or sets the height of the dialog. Must be a valid CSS height value like "600px" or "3em"
     /// Only used if Alignment is set to "HorizontalAlignment.Center"
-    /// </summary>  
+    /// </summary>
     public string? Height { get; set; }
 
     /// <summary>
@@ -121,7 +126,7 @@ public class DialogParameters : ComponentParameters, IDialogParameters
     internal bool ShowPrimaryAction => !string.IsNullOrEmpty(PrimaryAction);
 
     /// <summary>
-    /// Gets whether the secondary button is displayed or not. Depends on SecondaryAction having a value. 
+    /// Gets whether the secondary button is displayed or not. Depends on SecondaryAction having a value.
     /// </summary>
     internal bool ShowSecondaryAction => !string.IsNullOrEmpty(SecondaryAction);
 

src/Core/Components/Dialog/Parameters/IDialogParameters.cs

@@ -25,6 +25,7 @@ public interface IDialogParameters
     DialogType DialogType { get; set; }
     bool PreventScroll { get; set; }
     bool PreventDismissOnOverlayClick { get; set; }
+    bool Visible { get; set; }
     EventCallback<DialogResult> OnDialogResult { get; set; }
     EventCallback<DialogInstance> OnDialogClosing { get; set; }
     EventCallback<DialogInstance> OnDialogOpened { get; set; }