LibGUI+WindowServer: Inform WindowServer about parent/child windows

If a window has another window in its Core::Object ancestor chain,
we now communicate that relationship to WindowServer so that it can
act with awareness of parent/child windows.

1 files changed, 14 insertions, 1 deletions

diff --git a/Libraries/LibGUI/Window.cpp b/Libraries/LibGUI/Window.cpp
index ead7ba78fa..60d80d938e 100644
--- a/Libraries/LibGUI/Window.cpp
+++ b/Libraries/LibGUI/Window.cpp
@@ -89,6 +89,9 @@ void Window::show()
 {
     if (is_visible())
         return;
+
+    auto* parent_window = find_parent_window();
+
     m_override_cursor = StandardCursor::None;
     auto response = WindowServerConnection::the().send_sync<Messages::WindowServer::CreateWindow>(
         m_rect_when_windowless,
@@ -102,7 +105,8 @@ void Window::show()
         m_base_size,
         m_size_increment,
         (i32)m_window_type,
-        m_title_when_windowless);
+        m_title_when_windowless,
+        parent_window ? parent_window->window_id() : 0);
     m_window_id = response->window_id();
     m_visible = true;
 
@@ -113,6 +117,15 @@ void Window::show()
     update();
 }
 
+Window* Window::find_parent_window()
+{
+    for (auto* ancestor = parent(); ancestor; ancestor = ancestor->parent()) {
+        if (ancestor->is_window())
+            return static_cast<Window*>(ancestor);
+    }
+    return nullptr;
+}
+
 void Window::hide()
 {
     if (!is_visible())