WindowServer: Don't block child-windows of modal windows

ComboBox creates a regular (non-modal) window; I believe this is fine.
A Dialog (modal window) can contain a ComboBox; I believe this is fine.
A non-modal child window of a modal window (e.g. a ComboBox pop-out within
a Dialog) wasn't clickable, and was blocked in the WindowManager.
I want to change this behavior.

This edge case occurs when trying to select a month in the "Calendar"
Application.

1 files changed, 8 insertions, 1 deletions

diff --git a/Servers/WindowServer/Window.cpp b/Servers/WindowServer/Window.cpp
index 4f24dfb7af..4d506e1dc7 100644
--- a/Servers/WindowServer/Window.cpp
+++ b/Servers/WindowServer/Window.cpp
@@ -362,7 +362,14 @@ bool Window::is_active() const
 
 bool Window::is_blocked_by_modal_window() const
 {
-    return !is_modal() && client() && client()->is_showing_modal_window();
+    bool is_any_modal = false;
+    const Window* next = this;
+    while (!is_any_modal && next) {
+        is_any_modal = next->is_modal();
+        next = next->parent_window();
+    }
+
+    return !is_any_modal && client() && client()->is_showing_modal_window();
 }
 
 void Window::set_default_icon()