Added API Shell#getZoom()

This commit adds an API Shell#getZoom() which returns the native zoom of
the shell.

Author: amartya4256

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

@@ -18,6 +18,7 @@
 import org.eclipse.swt.*;
 import org.eclipse.swt.events.*;
 import org.eclipse.swt.graphics.*;
+import org.eclipse.swt.internal.*;
 import org.eclipse.swt.internal.cocoa.*;
 
 /**
@@ -1992,6 +1993,21 @@ public void setModified (boolean modified) {
 	window.setDocumentEdited (modified);
 }
 
+/**
+ * Returns the zoom of the shell.
+ * <p>
+ * Hint: The returned value is the zoom of the shell as originally considered by
+ * the OS and not an adjusted zoom value as considered by SWT autoscaling capabilities.
+ * </p>
+ *
+ * @return the zoom for this shell
+ *
+ * @since 3.133
+ */
+public int getZoom() {
+	return DPIUtil.getNativeDeviceZoom();
+}
+
 /**
  * Sets the shape of the shell to the region specified
  * by the argument.  When the argument is null, the

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

@@ -2786,6 +2786,21 @@ public void setModified (boolean modified) {
 	this.modified = modified;
 }
 
+/**
+ * Returns the zoom of the shell.
+ * <p>
+ * Hint: The returned value is the zoom of the shell as originally considered by
+ * the OS and not an adjusted zoom value as considered by SWT autoscaling capabilities.
+ * </p>
+ *
+ * @return the zoom for this shell
+ *
+ * @since 3.133
+ */
+public int getZoom() {
+	return DPIUtil.getNativeDeviceZoom();
+}
+
 /**
  * Sets the shape of the shell to the region specified
  * by the argument.  When the argument is null, the

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

@@ -1233,6 +1233,21 @@ public ToolBar getToolBar() {
 	return null;
 }
 
+/**
+ * Returns the zoom of the shell.
+ * <p>
+ * Hint: The returned value is the zoom of the shell as originally considered by
+ * the OS and not an adjusted zoom value as considered by SWT autoscaling capabilities.
+ * </p>
+ *
+ * @return the zoom for this shell
+ *
+ * @since 3.133
+ */
+public int getZoom() {
+	return DPIUtil.mapDPIToZoom(OS.GetDpiForWindow(handle));
+}
+
 @Override
 Composite findDeferredControl () {
 	return layoutCount > 0 ? this : null;