Initialize nativeZoom from Shell via OS call

Shell can be created on secondary monitor but inheriting the zoom of
parent (which could be on primary monitor) means the DPI change will not
be triggered.

Author: ShahzaibIbrahim

bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/widgets/Shell.java

@@ -300,18 +300,9 @@ public Shell (Display display, int style) {
 	if (handle != 0 && !embedded) {
 		state |= FOREIGN_HANDLE;
 	}
-
-	int shellNativeZoom;
-	if (parent != null) {
-		shellNativeZoom = parent.nativeZoom;
-	} else {
-		int mappedDPIZoom = getMonitor().getZoom();
-		shellNativeZoom = mappedDPIZoom;
-	}
-	this.nativeZoom = shellNativeZoom;
-
 	reskinWidget();
 	createWidget ();
+	this.nativeZoom = DPIUtil.mapDPIToZoom(OS.GetDpiForWindow(this.handle));
 }
 
 /**
@@ -2728,26 +2719,6 @@ LRESULT WM_WINDOWPOSCHANGING (long wParam, long lParam) {
 	return result;
 }
 
-@Override
-LRESULT WM_WINDOWPOSCHANGED (long wParam, long lParam) {
-	LRESULT result = super.WM_WINDOWPOSCHANGED(wParam, lParam);
-	// When the process is started with System DPI awareness and
-	// only the thread is PerMonitorV2 aware, there are some scenarios, when the
-	// OS does not send a DPI change event when a child Shell is positioned and
-	// opened on another monitor as its parent Shell. To work around that limitation
-	// this check is added to trigger a dpi change event if an unexpected DPI value is
-	// detected.
-	if (display.isRescalingAtRuntime()) {
-		int dpiForWindow = DPIUtil.mapDPIToZoom(OS.GetDpiForWindow(getShell().handle));
-		if (dpiForWindow != nativeZoom) {
-			WINDOWPOS lpwp = new WINDOWPOS ();
-			OS.MoveMemory (lpwp, lParam, WINDOWPOS.sizeof);
-			handleMonitorSpecificDpiChange(dpiForWindow, new Rectangle(lpwp.x, lpwp.y, lpwp.cx, lpwp.cy));
-		}
-	}
-	return result;
-}
-
 private static void handleDPIChange(Widget widget, int newZoom, float scalingFactor) {
 	if (!(widget instanceof Shell shell)) {
 		return;