[Win32] GetLocation as Point.WithMonitor to ensure correct monitor association

Previously, dialog positioning could be incorrect if the monitor was misidentified when restoring location. By returning the shell's location as a Point.WithMonitor (including monitor reference), we ensure dialogs and secondary shells open on the intended monitor, even in multi-monitor setups. This fixes issues where dialogs could appear on the wrong monitor after moving the parent shell.

Author: ShahzaibIbrahim

bundles/org.eclipse.swt/Eclipse SWT Tests/win32/org/eclipse/swt/widgets/CoordinateSystemMapperTests.java

@@ -218,6 +218,31 @@ void translateRectangleInPixelsForZeroSize(CoordinateSystemMapper mapper) {
 		assertEquals(rectInPts, mapper.translateFromDisplayCoordinates(rectInPxs));
 	}
 
+	@ParameterizedTest
+	@MethodSource("provideCoordinateSystemMappers")
+	void translateBoundsToSecondMonitor(CoordinateSystemMapper mapper) {
+		final int OFFSET = 30;
+		final int SIZE = OFFSET * 3;
+		setupMonitors(mapper);
+		Rectangle currentPosition = new Rectangle.WithMonitor(monitors[1].getClientArea().x - OFFSET, 0, SIZE, SIZE,
+				monitors[1]);
+		Rectangle result = mapper.translateFromDisplayCoordinates(currentPosition);
+		assertTrue(monitors[1].getClientArea().intersects(result));
+	}
+
+	@ParameterizedTest
+	@MethodSource("provideCoordinateSystemMappers")
+	void translatePointsToSecondMonitor(CoordinateSystemMapper mapper) {
+		final int OFFSET = 30;
+		final int SIZE = OFFSET * 3;
+		setupMonitors(mapper);
+		Point currentPosition = new Point.WithMonitor(monitors[1].getClientArea().x - OFFSET, 0, monitors[1]);
+		Point size = new Point(SIZE, SIZE);
+		Point result = mapper.translateFromDisplayCoordinates(currentPosition);
+		Rectangle resultRect = new Rectangle(result.x, result.y, size.x, size.y);
+		assertTrue(monitors[1].getClientArea().intersects(resultRect));
+	}
+
 	private Point createExpectedPoint(CoordinateSystemMapper mapper, int x, int y, Monitor monitor) {
 		if (mapper instanceof SingleZoomCoordinateSystemMapper) {
 			return new Point(x, y);

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

@@ -93,7 +93,8 @@ public Rectangle mapMonitorBounds(Rectangle rect, int zoom) {
 
 	@Override
 	public Point translateFromDisplayCoordinates(Point point) {
-		return translateLocationInPixelsToPoints(point.x, point.y);
+		Monitor monitor = point instanceof Point.WithMonitor pointWithMonitor ? pointWithMonitor.getMonitor() : null;
+		return translateLocationInPixelsToPoints(point.x, point.y, monitor);
 	}
 
 	@Override
@@ -117,7 +118,7 @@ public Rectangle translateToDisplayCoordinates(Rectangle rect) {
 	@Override
 	public Point getCursorLocation() {
 		Point cursorLocationInPixels = display.getCursorLocationInPixels();
-		return translateLocationInPixelsToPoints(cursorLocationInPixels.x, cursorLocationInPixels.y);
+		return translateLocationInPixelsToPoints(cursorLocationInPixels.x, cursorLocationInPixels.y, null);
 	}
 
 	@Override
@@ -131,8 +132,10 @@ private Point translateLocationInPointsToPixels(int x, int y, Monitor monitor) {
 		return getPixelsFromPoint(monitor, x, y);
 	}
 
-	private Point translateLocationInPixelsToPoints(int x, int y) {
-		Monitor monitor = getContainingMonitorForPixels(x, y);
+	private Point translateLocationInPixelsToPoints(int x, int y, Monitor monitor) {
+		if (monitor == null) {
+			monitor = getContainingMonitorForPixels(x, y);
+		}
 		return getPointFromPixels(monitor, x, y);
 	}
 

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

@@ -924,7 +924,7 @@ public int getAlpha () {
 	OS.GetWindowRect (handle, rect);
 	int width = rect.right - rect.left;
 	int height = rect.bottom - rect.top;
-	return new Rectangle (rect.left, rect.top, width, height);
+	return new Rectangle.WithMonitor (rect.left, rect.top, width, height, getMonitor());
 }
 
 ToolTip getCurrentToolTip () {
@@ -1017,7 +1017,7 @@ public int getImeInputMode () {
 	if (OS.IsIconic (handle)) return super.getLocationInPixels ();
 	RECT rect = new RECT ();
 	OS.GetWindowRect (handle, rect);
-	return new Point (rect.left, rect.top);
+	return new Point.WithMonitor (rect.left, rect.top, getMonitor());
 }
 
 @Override