Fixes WinForms PrintPreviewControl ForeColor displays incorrectly only when set to White

src/System.Windows.Forms/System/Windows/Forms/Printing/PrintPreviewControl.cs

@@ -49,6 +49,7 @@ public partial class PrintPreviewControl : Control
     private double _zoom = DefaultZoom;
     private bool _pageInfoCalcPending;
     private bool _exceptionPrinting;
+    private bool _isForeColorSet;
 
     /// <summary>
     ///  Initializes a new instance of the <see cref="PrintPreviewControl"/> class.
@@ -57,6 +58,7 @@ public PrintPreviewControl()
     {
         ResetBackColor();
         ResetForeColor();
+        ForeColorChanged += (_, _) => _isForeColorSet = true;
         Size = new Size(100, 100);
         SetStyle(ControlStyles.ResizeRedraw, false);
         SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint | ControlStyles.OptimizedDoubleBuffer, true);
@@ -295,9 +297,13 @@ public override string Text
     internal override bool ShouldSerializeBackColor() => !BackColor.Equals(SystemColors.AppWorkspace);
 
     [EditorBrowsable(EditorBrowsableState.Never)]
-    public override void ResetForeColor() => ForeColor = Color.White;
+    public override void ResetForeColor()
+    {
+        ForeColor = SystemColors.ControlText;
+        _isForeColorSet = false;
+    }
 
-    internal override bool ShouldSerializeForeColor() => !ForeColor.Equals(Color.White);
+    internal override bool ShouldSerializeForeColor() => _isForeColorSet;
 
     internal override bool SupportsUiaProviders => true;
 
@@ -592,7 +598,7 @@ private void CalculatePageInfo()
 
     private void DrawMessage(Graphics g, Rectangle rect, bool isExceptionPrinting)
     {
-        Color brushColor = ShouldSerializeForeColor() ? ForeColor : SystemColors.ControlText;
+        Color brushColor = _isForeColorSet ? ForeColor : SystemColors.ControlText;
         if (SystemInformation.HighContrast && Parent is Control parent)
         {
             brushColor = parent.BackColor;

src/test/unit/System.Windows.Forms/System/Windows/Forms/Printing/PrintPreviewControlTests.cs

@@ -24,6 +24,50 @@ public void ShowPrintPreviewControl_BackColorIsCorrect()
         Assert.Equal(Color.Green.ToArgb(), actualBackColorArgb);
     }
 
+    [Fact]
+    public void PrintPreviewControl_ForeColor_DefaultIsControlText()
+    {
+        PrintPreviewControl control = new();
+
+        Assert.Equal(SystemColors.ControlText.ToArgb(), control.ForeColor.ToArgb());
+    }
+
+    [Fact]
+    public void PrintPreviewControl_ForeColorNotSet_ShouldSerializeReturnsFalse()
+    {
+        PrintPreviewControl control = new();
+
+        // ForeColor not explicitly set: ShouldSerializeForeColor must return false.
+        Assert.False(control.TestAccessor.Dynamic.ShouldSerializeForeColor());
+    }
+
+    [Fact]
+    public void PrintPreviewControl_ForeColorWhiteExplicitlySet_ShouldSerializeReturnsTrue()
+    {
+        // Regression: #14420 - explicitly setting White must be distinguishable from the default.
+        PrintPreviewControl control = new() { ForeColor = Color.White };
+
+        Assert.True(control.TestAccessor.Dynamic.ShouldSerializeForeColor());
+    }
+
+    [Fact]
+    public void PrintPreviewControl_ForeColorNonDefault_ShouldSerializeReturnsTrue()
+    {
+        PrintPreviewControl control = new() { ForeColor = Color.Red };
+
+        Assert.True(control.TestAccessor.Dynamic.ShouldSerializeForeColor());
+    }
+
+    [Fact]
+    public void PrintPreviewControl_ForeColorReset_ShouldSerializeReturnsFalse()
+    {
+        PrintPreviewControl control = new() { ForeColor = Color.Red };
+        control.ResetForeColor();
+
+        Assert.False(control.TestAccessor.Dynamic.ShouldSerializeForeColor());
+        Assert.Equal(SystemColors.ControlText.ToArgb(), control.ForeColor.ToArgb());
+    }
+
     [Fact]
     public void ShowPrintPreviewControlHighContrast_BackColorIsCorrect()
     {