Do not activate the form if MinimumSize changes (#13715)

## Proposed changes

- In `UpdateMinimumSize` of Form.cs add `SET_WINDOW_POS_FLAGS.SWP_NOACTIVATE` so that the form is not automatically activated when the `MinimumSize` property changes

<!-- We are in TELL-MODE the following section must be completed -->

## Customer Impact

- Setting MinimumSize will not activate form

## Regression? 

- No

Author: LeafShi1

src/System.Windows.Forms/System/Windows/Forms/Form.cs

@@ -1368,7 +1368,7 @@ private void UpdateMinimumSize(Size value, bool updateFormSize = true)
                     Location.Y,
                     Size.Width,
                     Size.Height,
-                    SET_WINDOW_POS_FLAGS.SWP_NOZORDER);
+                    SET_WINDOW_POS_FLAGS.SWP_NOZORDER | SET_WINDOW_POS_FLAGS.SWP_NOACTIVATE);
             }
         }
 

src/test/integration/UIIntegrationTests/FormTests.cs

@@ -152,4 +152,26 @@ await RunFormWithoutControlAsync(
             },
             testDriverAsync);
     }
+
+    [WinFormsFact]
+    public void Form_MinimumSize_DoesNotChangeDisplayOrder()
+    {
+        // Initialize Form1 and Form2.
+        using Form form1 = new Form { Text = "Form1" };
+        using Form form2 = new Form { Text = "Form2" };
+
+        // Display the forms.
+        form1.Show();
+        form2.Show();
+
+        // Set initial hierarchy: Form2 should be displayed in front of Form1.
+        form2.BringToFront();
+        Assert.True(form2.TopMost || form2.Focused, "Form2 should be displayed in front of Form1");
+
+        // Set the MinimumSize property of Form1.
+        form1.MinimumSize = new Size(300, 300);
+
+        // Verify the hierarchy remains unchanged.
+        Assert.True(form2.TopMost || form2.Focused, "Form2 should still be displayed in front after setting MinimumSize");
+    }
 }