[gtk/win32.fixes.4-4: 5/9] GDK-Win32: Make surface ready for updates

[Chun-wei Fan <fanchunwei src gnome org>]

commit 4bc958e00c7a27f4ef366c09a96ef65a016ed71e
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Thu Jul 29 18:35:08 2021 +0800

    GDK-Win32: Make surface ready for updates
    
    Make the toplevel surface respond to size computations unless it is just being
    created, or maximized, made fullscreen or underwent an AeroSnap operation.
    
    This will ensure that the surface size is properly computed in time, so that
    surfaces can be resized as needed.
    
    This will fix issues 3728 and 3799.

 gdk/win32/gdksurface-win32.c | 45 +++++++++++++++++++++++++++++++++++++++++---
 gdk/win32/gdksurface-win32.h |  1 +
 2 files changed, 43 insertions(+), 3 deletions(-)
---
diff --git a/gdk/win32/gdksurface-win32.c b/gdk/win32/gdksurface-win32.c
index e91ed4efdf..59bd3fcca8 100644
--- a/gdk/win32/gdksurface-win32.c
+++ b/gdk/win32/gdksurface-win32.c
@@ -654,6 +654,7 @@ _gdk_win32_display_create_surface (GdkDisplay     *display,
 
   g_object_unref (frame_clock);
   impl->hdc = GetDC (impl->handle);
+  impl->inhibit_configure = TRUE;
 
   return surface;
 }
@@ -1095,7 +1096,8 @@ gdk_win32_surface_resize (GdkSurface *window,
                            SWP_NOACTIVATE | SWP_NOMOVE | SWP_NOZORDER));
   window->resize_count += 1;
 
-  gdk_surface_request_layout (window);
+  if (!GDK_WIN32_SURFACE (window)->force_recompute_size)
+    gdk_surface_request_layout (window);
 }
 
 static void
@@ -2552,6 +2554,12 @@ apply_snap (GdkSurface             *window,
       snap_up (window);
       break;
     }
+
+  if (snap != GDK_WIN32_AEROSNAP_STATE_UNDETERMINED)
+    {
+      GDK_WIN32_SURFACE (window)->inhibit_configure = TRUE;
+      GDK_WIN32_SURFACE (window)->force_recompute_size = FALSE;
+    }
 }
 
 /* Registers a dumb window class. This window
@@ -3447,6 +3455,7 @@ setup_drag_move_resize_context (GdkSurface                   *window,
   GdkWin32Surface *impl = GDK_WIN32_SURFACE (window);
   gboolean maximized = gdk_toplevel_get_state (GDK_TOPLEVEL (window)) & GDK_TOPLEVEL_STATE_MAXIMIZED;
   int root_x, root_y;
+  gboolean restore_configure = FALSE;
 
   gdk_win32_surface_get_root_coords (window, x, y, &root_x, &root_y);
 
@@ -3495,6 +3504,7 @@ setup_drag_move_resize_context (GdkSurface                   *window,
        impl->snap_state == GDK_WIN32_AEROSNAP_STATE_FULLUP))
     {
       discard_snapinfo (window);
+      restore_configure = TRUE;
     }
   else if (maximized ||
            (impl->snap_state == GDK_WIN32_AEROSNAP_STATE_HALFRIGHT ||
@@ -3509,6 +3519,7 @@ setup_drag_move_resize_context (GdkSurface                   *window,
       gboolean left_half;
       GdkDisplay *display;
 
+      restore_configure = TRUE;
       display = gdk_surface_get_display (window);
       monitor = gdk_display_get_monitor_at_surface (display, window);
       gdk_surface_get_geometry (window, &wx, &wy, &wwidth, &wheight);
@@ -3679,6 +3690,9 @@ setup_drag_move_resize_context (GdkSurface                   *window,
         }
     }
 
+  if (restore_configure)
+    impl->inhibit_configure = FALSE;
+
   _gdk_win32_get_window_rect (window, &rect);
 
   cursor_name = get_cursor_name_from_op (op, edge);
@@ -4136,6 +4150,8 @@ gdk_win32_surface_maximize (GdkSurface *window)
                           _gdk_win32_surface_state_to_string (window->state)));
 
   impl = GDK_WIN32_SURFACE (window);
+  impl->inhibit_configure = TRUE;
+  impl->force_recompute_size = FALSE;
 
   if (GDK_SURFACE_IS_MAPPED (window))
     GtkShowWindow (window, SW_MAXIMIZE);
@@ -4148,6 +4164,8 @@ gdk_win32_surface_maximize (GdkSurface *window)
 static void
 gdk_win32_surface_unmaximize (GdkSurface *window)
 {
+  GdkWin32Surface *impl;
+
   g_return_if_fail (GDK_IS_SURFACE (window));
 
   if (GDK_SURFACE_DESTROYED (window))
@@ -4165,6 +4183,14 @@ gdk_win32_surface_unmaximize (GdkSurface *window)
     gdk_synthesize_surface_state (window,
                                 GDK_TOPLEVEL_STATE_MAXIMIZED,
                                 0);
+
+  impl = GDK_WIN32_SURFACE (window);
+
+  if (impl->inhibit_configure)
+    {
+      impl->inhibit_configure = FALSE;
+      impl->force_recompute_size = TRUE;
+    }
 }
 
 static void
@@ -4589,6 +4615,9 @@ _gdk_win32_surface_request_layout (GdkSurface *surface)
                                          &surface->x, &surface->y,
                                           NULL, NULL);
         }
+
+      if (!impl->inhibit_configure)
+        impl->force_recompute_size = TRUE;
     }
 }
 
@@ -4603,8 +4632,18 @@ _gdk_win32_surface_compute_size (GdkSurface *surface)
 
   if (!impl->drag_move_resize_context.native_move_resize_pending)
     {
-      surface->width = impl->next_layout.configured_width;
-      surface->height = impl->next_layout.configured_height;
+      if (GDK_IS_TOPLEVEL (surface) && impl->force_recompute_size)
+        {
+          surface->width = width;
+          surface->height = height;
+          gdk_win32_surface_resize (surface, width, height);
+          impl->force_recompute_size = FALSE;
+        }
+      else
+        {
+          surface->width = impl->next_layout.configured_width;
+          surface->height = impl->next_layout.configured_height;
+        }
 
       _gdk_surface_update_size (surface);
     }
diff --git a/gdk/win32/gdksurface-win32.h b/gdk/win32/gdksurface-win32.h
index 88a19f8018..376dacbb60 100644
--- a/gdk/win32/gdksurface-win32.h
+++ b/gdk/win32/gdksurface-win32.h
@@ -338,6 +338,7 @@ struct _GdkWin32Surface
     int configured_height;
     RECT configured_rect;
   } next_layout;
+  gboolean force_recompute_size;
 
 #ifdef GDK_WIN32_ENABLE_EGL
   EGLSurface egl_surface;