LibGfx+WindowServer: Ensure constrain-to-rect ends up inside the rect

Author: https://github.com/BenWiederhake
Commit: 4b7639c3b5
Pull-request: https://github.com/SerenityOS/serenity/pull/18687
Reviewed-by: https://github.com/gmta ✅

Userland/Libraries/LibGfx/Point.cpp

@@ -15,8 +15,8 @@ namespace Gfx {
 template<typename T>
 void Point<T>::constrain(Rect<T> const& rect)
 {
-    m_x = AK::clamp<T>(x(), rect.left(), rect.left() + rect.width());
-    m_y = AK::clamp<T>(y(), rect.top(), rect.top() + rect.height());
+    m_x = AK::clamp<T>(x(), rect.left(), rect.right());
+    m_y = AK::clamp<T>(y(), rect.top(), rect.bottom());
 }
 
 template<typename T>