Feat: Rookie now flashes in taskbar when FlexibleMessageBox is thrown and window is inactive, Fix: FlexibleMessageBox positioning for inactive/minimized window

Added taskbar flashing to notify users when a task is complete or requires user input (= when FlexibleMessageBox is thrown) while the application is inactive or minimized. Enhanced FlexibleMessageBox to better handle when the application is minimized by centering the dialog on the screen and repositioning it when the form is restored.

FlexibleMessageBox.cs

@@ -83,7 +83,18 @@ namespace JR.Utils.GUI.Forms
             private const int CS_DROPSHADOW = 0x00020000;
             private const int WM_NCLBUTTONDOWN = 0xA1;
             private const int HT_CAPTION = 0x2;
-            private const int BORDER_RADIUS = 12;
+            private const uint FLASHW_TRAY = 0x00000002;
+            private const uint FLASHW_TIMERNOFG = 0x0000000C;
+
+            [StructLayout(LayoutKind.Sequential)]
+            private struct FLASHWINFO
+            {
+                public uint cbSize;
+                public IntPtr hwnd;
+                public uint dwFlags;
+                public uint uCount;
+                public uint dwTimeout;
+            }
 
             [DllImport("user32.dll")]
             private static extern int SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, IntPtr lParam);
@@ -91,6 +102,9 @@ namespace JR.Utils.GUI.Forms
             [DllImport("user32.dll")]
             private static extern bool ReleaseCapture();
 
+            [DllImport("user32.dll")]
+            private static extern bool FlashWindowEx(ref FLASHWINFO pwfi);
+
             protected override CreateParams CreateParams
             {
                 get
@@ -604,7 +618,7 @@ namespace JR.Utils.GUI.Forms
                     ownerForm = Form.ActiveForm;
                 }
 
-                if (ownerForm != null && ownerForm.Visible)
+                if (ownerForm != null && ownerForm.Visible && ownerForm.WindowState != FormWindowState.Minimized)
                 {
                     // Center relative to owner window
                     int x = ownerForm.Left + (ownerForm.Width - flexibleMessageBoxForm.Width) / 2;
@@ -620,7 +634,7 @@ namespace JR.Utils.GUI.Forms
                 }
                 else
                 {
-                    // No owner found: center on current screen
+                    // No owner found or minimized: center on current screen
                     CenterOnScreen(flexibleMessageBoxForm);
                 }
             }
@@ -848,8 +862,45 @@ namespace JR.Utils.GUI.Forms
                 int contentWidth = flexibleMessageBoxForm.ClientSize.Width - 16; // 8px padding
                 flexibleMessageBoxForm.titlePanel.Width = contentWidth;
 
+                // Get owner form
+                Form ownerForm = owner as Form ?? Form.ActiveForm;
+                bool ownerWasMinimized = ownerForm != null && ownerForm.WindowState == FormWindowState.Minimized;
+
                 SetDialogStartPosition(flexibleMessageBoxForm, owner);
 
+                // If owner was minimized, reposition dialog when owner is restored
+                if (ownerWasMinimized && ownerForm != null)
+                {
+                    EventHandler resizeHandler = null;
+                    resizeHandler = (s, e) =>
+                    {
+                        if (ownerForm.WindowState != FormWindowState.Minimized && flexibleMessageBoxForm.Visible && !flexibleMessageBoxForm.IsDisposed)
+                        {
+                            SetDialogStartPosition(flexibleMessageBoxForm, owner);
+                            ownerForm.Resize -= resizeHandler;
+                        }
+                    };
+                    ownerForm.Resize += resizeHandler;
+                }
+
+                // Flash taskbar if application is inactive or minimized
+                if (Form.ActiveForm == null || ownerWasMinimized)
+                {
+                    Form targetForm = ownerForm ?? Application.OpenForms.Cast<Form>().FirstOrDefault(f => f != null && !f.IsDisposed && f != flexibleMessageBoxForm && f.Visible);
+                    if (targetForm != null && !targetForm.IsDisposed)
+                    {
+                        FLASHWINFO info = new FLASHWINFO
+                        {
+                            cbSize = (uint)Marshal.SizeOf(typeof(FLASHWINFO)),
+                            hwnd = targetForm.Handle,
+                            dwFlags = FLASHW_TRAY | FLASHW_TIMERNOFG,
+                            uCount = 5,
+                            dwTimeout = 0
+                        };
+                        _ = FlashWindowEx(ref info);
+                    }
+                }
+
                 return flexibleMessageBoxForm.ShowDialog(owner);
             }