[PATCH 0/1] MR6683: win32u: Use parent-relative coordinates for old window rectangles.

[Rémi Bernon (＠rbernon)]

Since 4e06b87633ec7e04822ad4f4854df7ae43f0d7e0, we are moving the window rects,
which is in screen coordinates for the old rects, because invalidate_dce expects
it, but in parent coordinates for the new rects.

This makes the old and new rectangles to be consistently using parent-relative
coordinates, fixing some broken window bits copy with child windows.

Fixes 4e06b87633ec7e04822ad4f4854df7ae43f0d7e0

[PATCH 1/1] win32u: Use parent-relative coordinates for old window rectangles.

[Rémi Bernon]

From: Rémi Bernon

Since 4e06b87633ec7e04822ad4f4854df7ae43f0d7e0, we are moving the window rects,
which is in screen coordinates for the old rects, because invalidate_dce expects
it, but in parent coordinates for the new rects.

This makes the old and new rectangles to be consistently using parent-relative
coordinates, fixing some broken window bits copy with child windows.

Fixes 4e06b87633ec7e04822ad4f4854df7ae43f0d7e0
---
 dlls/win32u/dce.c            | 32 ++++++++++++++++++++++----------
 dlls/win32u/ntuser_private.h |  2 +-
 dlls/win32u/window.c         |  5 +----
 3 files changed, 24 insertions(+), 15 deletions(-)

diff --git a/dlls/win32u/dce.c b/dlls/win32u/dce.c
index 3fa18fc8ace..dbb4da0202b 100644
--- a/dlls/win32u/dce.c
+++ b/dlls/win32u/dce.c
@@ -1146,19 +1146,16 @@ static void make_dc_dirty( struct dce *dce )
  * rectangle. In addition, pWnd->parent DCEs may need to be updated if
  * DCX_CLIPCHILDREN flag is set.
  */
-void invalidate_dce( WND *win, const RECT *extra_rect )
+void invalidate_dce( WND *win, const RECT *old_rect )
 {
     UINT context;
-    RECT window_rect;
     struct dce *dce;

if (!win->parent) return;

context = set_thread_dpi_awareness_context( get_window_dpi_awareness_context( win->obj.handle ));
-    get_window_rect( win->obj.handle, &window_rect, get_thread_dpi() );

-    TRACE("%p parent %p %s (%s)\n",
-          win->obj.handle, win->parent, wine_dbgstr_rect(&window_rect), wine_dbgstr_rect(extra_rect) );
+    TRACE("%p parent %p, old_rect %s\n", win->obj.handle, win->parent, wine_dbgstr_rect(old_rect) );

/* walk all DCEs and fixup non-empty entries */

@@ -1182,11 +1179,26 @@ void invalidate_dce( WND *win, const RECT *extra_rect )
         /* otherwise check if the window rectangle intersects this DCE window */
         if (win->parent == dce->hwnd || is_child( win->parent, dce->hwnd ))
         {
-            RECT dce_rect, tmp;
-            get_window_rect( dce->hwnd, &dce_rect, get_thread_dpi() );
-            if (intersect_rect( &tmp, &dce_rect, &window_rect ) ||
-                (extra_rect && intersect_rect( &tmp, &dce_rect, extra_rect )))
-                make_dc_dirty( dce );
+            RECT tmp, new_window_rect, old_window_rect;
+            struct window_rects rects;
+
+            /* get the parent client-relative old/new window rects */
+            get_window_rects( win->obj.handle, COORDS_PARENT, &rects, get_thread_dpi() );
+            old_window_rect = old_rect ? *old_rect : rects.window;
+            new_window_rect = rects.window;
+
+            /* get the DCE window rect in client-relative coordinates */
+            get_window_rects( dce->hwnd, COORDS_CLIENT, &rects, get_thread_dpi() );
+            if (win->parent != dce->hwnd)
+            {
+                /* map the window rects from parent client-relative to DCE window client-relative coordinates */
+                map_window_points( win->parent, dce->hwnd, (POINT *)&new_window_rect, 2, get_thread_dpi() );
+                map_window_points( win->parent, dce->hwnd, (POINT *)&old_window_rect, 2, get_thread_dpi() );
+            }
+
+            /* check if any of the window rects intersects with the DCE window rect */
+            if (intersect_rect( &tmp, &rects.window, &old_window_rect )) make_dc_dirty( dce );
+            else if (intersect_rect( &tmp, &rects.window, &new_window_rect )) make_dc_dirty( dce );
         }
     }
     set_thread_dpi_awareness_context( context );
diff --git a/dlls/win32u/ntuser_private.h b/dlls/win32u/ntuser_private.h
index fd594488c08..f7d84e12cd1 100644
--- a/dlls/win32u/ntuser_private.h
+++ b/dlls/win32u/ntuser_private.h
@@ -221,7 +221,7 @@ HICON alloc_cursoricon_handle( BOOL is_icon );

/* dce.c */
 extern void free_dce( struct dce *dce, HWND hwnd );
-extern void invalidate_dce( WND *win, const RECT *extra_rect );
+extern void invalidate_dce( WND *win, const RECT *old_rect );

/* message.c */
 struct peek_message_filter
diff --git a/dlls/win32u/window.c b/dlls/win32u/window.c
index f67ddc2903c..5bda3a5913a 100644
--- a/dlls/win32u/window.c
+++ b/dlls/win32u/window.c
@@ -2013,13 +2013,10 @@ static BOOL apply_window_pos( HWND hwnd, HWND insert_after, UINT swp_flags, stru
     if (is_child) monitor_dpi = get_win_monitor_dpi( parent, &raw_dpi );
     else monitor_dpi = monitor_dpi_from_rect( new_rects->window, get_thread_dpi(), &raw_dpi );

-    get_window_rects( hwnd, COORDS_SCREEN, &old_rects, get_thread_dpi() );
+    get_window_rects( hwnd, COORDS_PARENT, &old_rects, get_thread_dpi() );
     if (IsRectEmpty( &valid_rects[0] ) || is_layered) valid_rects = NULL;

if (!(win = get_win_ptr( hwnd )) || win == WND_DESKTOP || win == WND_OTHER_PROCESS) return FALSE;
-
-    old_rects.visible = win->rects.visible;
-    old_rects.client = win->rects.client;
     old_surface = win->surface;
     if (old_surface != new_surface) swp_flags |= SWP_FRAMECHANGED;  /* force refreshing non-client area */
     if (new_surface == &dummy_surface) swp_flags |= SWP_NOREDRAW;