Tooltip Infinite Loop fix for per-monitor #557

This commit contributes to fixing the infinite looping effect on showing
a tooltip of the tree using per-monitor (V2) awareness on win32 when a
tooltip is spans over two monitors having more area on the other monitor
than the one on which the cursor is placed. The fix makes sure that the
tooltip is not drawn on the other monitors by shifting or adjusting the
width.

contributes to #557

Author: amartya4256

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

@@ -8161,6 +8161,30 @@ LRESULT wmNotifyToolTip (NMHDR hdr, long wParam, long lParam) {
 				int height = toolRect.bottom - toolRect.top;
 				int flags = OS.SWP_NOACTIVATE | OS.SWP_NOZORDER | OS.SWP_NOSIZE;
 				if (isCustomToolTip ()) flags &= ~OS.SWP_NOSIZE;
+				// Retrieve the monitor containing the cursor position, as tooltip placement
+				// must occur on the same monitor to avoid potential infinite loops. When a tooltip
+				// appears on a different monitor than the cursor, the operating system may
+				// attempt to rescale it based on that monitor's settings. This rescaling
+				// triggers additional display messages to SWT, creating an infinite loop
+				// of positioning and rescaling events.
+				Point cursorLocation = display.getCursorLocation();
+				if (cursorLocation instanceof MonitorAwarePoint map) {
+					Monitor monitor = map.getMonitor();
+					Rectangle monitorBounds = new Rectangle(monitor.x,  monitor.y, DPIUtil.scaleUp(monitor.width, monitor.zoom), DPIUtil.scaleUp(monitor.height, monitor.zoom));
+					if (toolRect.left < monitor.x) {
+						int offset = monitor.x - toolRect.left;
+						toolRect.left += offset;
+					}
+					if ((toolRect.left + width) > (monitorBounds.x + monitorBounds.width)) {
+						if (width <= monitorBounds.width) {
+							toolRect.left = monitorBounds.x + monitorBounds.width - width;
+						} else {
+							toolRect.left = monitorBounds.x;
+						}
+						int offset = (toolRect.left + width) - (monitorBounds.x + monitorBounds.width);
+						width -= offset;
+					}
+				}
 				OS.SetWindowPos (itemToolTipHandle, 0, toolRect.left, toolRect.top, width, height, flags);
 				return LRESULT.ONE;
 			}