[PATCH v4 6/9] win32u: Update children window state when the parent state changes.

[Alexandros Frantzis]

From: Alexandros Frantzis

Since changes in a parent window state may affect the children state
in the driver, ensure the driver gets a chance to update its internal
state.
---
 dlls/win32u/window.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/dlls/win32u/window.c b/dlls/win32u/window.c
index 73478438928..e34a1a296fd 100644
--- a/dlls/win32u/window.c
+++ b/dlls/win32u/window.c
@@ -3517,6 +3517,8 @@ done:
     return after;
 }

+static void update_children_window_state( HWND hwnd );
+
 /* NtUserSetWindowPos implementation */
 BOOL set_window_pos( WINDOWPOS *winpos, int parent_x, int parent_y )
 {
@@ -3653,6 +3655,8 @@ BOOL set_window_pos( WINDOWPOS *winpos, int parent_x, int parent_y )
     if ((winpos->flags & (SWP_NOSIZE|SWP_NOMOVE|SWP_FRAMECHANGED)) != (SWP_NOSIZE|SWP_NOMOVE))
         NtUserNotifyWinEvent( EVENT_OBJECT_LOCATIONCHANGE, winpos->hwnd, OBJID_WINDOW, 0 );

+    update_children_window_state( winpos->hwnd );
+
     ret = TRUE;
 done:
     set_thread_dpi_awareness_context( context );
@@ -4386,6 +4390,23 @@ void update_window_state( HWND hwnd )
     if (surface) window_surface_release( surface );

set_thread_dpi_awareness_context( context );
+
+    update_children_window_state( hwnd );
+}
+
+static void update_children_window_state( HWND hwnd )
+{
+    HWND *children;
+    int i;
+
+    if (!(children = list_window_children( 0, hwnd, NULL, 0 ))) return;
+
+    for (i = 0; children[i]; i++)
+    {
+        if (is_window( children[i] )) update_window_state( children[i] );
+    }
+
+    free( children );
 }

/***********************************************************************