Fix for Mac drawing bug issue 1012

- Add a new selector setClipsToBounds
- Set this selector to true in Widget#drawRect
- See #1012

bundles/org.eclipse.swt/Eclipse SWT PI/cocoa/org/eclipse/swt/internal/cocoa/NSView.java

@@ -244,6 +244,10 @@ public void setBoundsSize(NSSize newSize) {
 	OS.objc_msgSend(this.id, OS.sel_setBoundsSize_, newSize);
 }
 
+public void setClipsToBounds(boolean clipsToBounds) {
+	OS.objc_msgSend(this.id, OS.sel_setClipsToBounds_, clipsToBounds);
+}
+
 public void setFocusRingType(long focusRingType) {
 	OS.objc_msgSend(this.id, OS.sel_setFocusRingType_, focusRingType);
 }

bundles/org.eclipse.swt/Eclipse SWT PI/cocoa/org/eclipse/swt/internal/cocoa/OS.java

@@ -162,6 +162,9 @@ public static int VERSION (int major, int minor, int bugfix) {
 
 	public static final long class_NSToolbarView = objc_getClass("NSToolbarView");
 
+	/** Since macOS 14 the clipsToBounds property of NSView is exposed */
+	public static final long sel_setClipsToBounds_ = Selector.sel_setClipsToBounds_.value;
+
 	/*
 	 * Wrapper function which will call NSSavePanel.beginSheetModalForWindow. This
 	 * implementation allows passing of objective-C block from Java to C code, and

bundles/org.eclipse.swt/Eclipse SWT PI/cocoa/org/eclipse/swt/internal/cocoa/Selector.java

@@ -84,6 +84,9 @@ public enum Selector {
 
 	, sel_awtAppDelegate("awtAppDelegate")
 
+	/** Since macOS 14 the clipsToBounds property of NSView is exposed */
+	, sel_setClipsToBounds_("setClipsToBounds:")
+
 	  /** This section is auto generated */
 
 	, sel_CGEvent("CGEvent")

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

@@ -759,6 +759,13 @@ void drawRect (long id, long sel, NSRect rect) {
 	if (!isDrawing()) return;
 	Display display = this.display;
 	NSView view = new NSView(id);
+
+	/*
+	* Since macOS 14 the clipsToBounds property of NSView has to be set to true
+	* See https://developer.apple.com/documentation/macos-release-notes/appkit-release-notes-for-macos-14
+	*/
+	view.setClipsToBounds(true);
+
 	display.isPainting.addObject(view);
 	NSGraphicsContext context = NSGraphicsContext.currentContext();
 	context.saveGraphicsState();