[gtk/wip.win32.fixes: 8/18] GDK-Win32: Fix AeroSnap indicator and positioning

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

commit 27eaba7ab9c7d09a7248b656cc0d72fcc2af1a2b
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Tue Jul 6 17:15:39 2021 +0800

    GDK-Win32: Fix AeroSnap indicator and positioning
    
    Ensure that we take the DPI scaling into account so that surfaces will
    be placed at their correct positions upon an AeroSnap operation on HiDPI
    displays.
    
    Also, use the X coordinate of the surface as-is during snap up so that
    we do not inadvertently move the surface to the very left.  Also fix the
    AeroSnap indicator drawing for snap up so that it is drawn at the
    correct places.

 gdk/win32/gdksurface-win32.c | 22 ++++++++--------------
 1 file changed, 8 insertions(+), 14 deletions(-)
---
diff --git a/gdk/win32/gdksurface-win32.c b/gdk/win32/gdksurface-win32.c
index 2095402725..d7ff31f1cd 100644
--- a/gdk/win32/gdksurface-win32.c
+++ b/gdk/win32/gdksurface-win32.c
@@ -2322,19 +2322,11 @@ snap_up (GdkSurface *window)
   y = 0;
   height = maxysize;
 
-  x = x - impl->shadow.left;
-  y = y - impl->shadow.top;
+  x = surface->x - impl->shadow.left / impl->surface_scale;
+  y = y - impl->shadow.top / impl->surface_scale;
   width += impl->shadow_x;
   height += impl->shadow_y;
 
-  /* XXX: FIXME, AeroSnap snap_up() not really working well,
-   *
-   *    * The snap_up() puts the window at the top left corner.
-   *    * Without the following call, the height maximizes but we see a spew of
-   *      "GdkToplevelSize: geometry size (x,y) exceeds bounds" warnings
-   */
-  compute_toplevel_size (window, TRUE, &width, &height);
-
   gdk_win32_surface_move_resize (window, x, y, width, height);
 }
 
@@ -2356,8 +2348,8 @@ snap_left (GdkSurface  *window,
 
   rect.width = rect.width / 2;
 
-  rect.x = rect.x - impl->shadow.left;
-  rect.y = rect.y - impl->shadow.top;
+  rect.x = rect.x - impl->shadow.left / impl->surface_scale;
+  rect.y = rect.y - impl->shadow.top / impl->surface_scale;
   rect.width = rect.width + impl->shadow_x;
   rect.height = rect.height + impl->shadow_y;
 
@@ -2385,8 +2377,8 @@ snap_right (GdkSurface  *window,
   rect.width = rect.width / 2;
   rect.x += rect.width;
 
-  rect.x = rect.x - impl->shadow.left;
-  rect.y = rect.y - impl->shadow.top;
+  rect.x = rect.x - impl->shadow.left / impl->surface_scale;
+  rect.y = rect.y - impl->shadow.top / impl->surface_scale;
   rect.width = rect.width + impl->shadow_x;
   rect.height = rect.height + impl->shadow_y;
 
@@ -3021,6 +3013,7 @@ update_fullup_indicator (GdkSurface                   *window,
   to.height = gdk_surface_get_height (window);
 
   to.y = 0;
+  to.x = window->x;
   to.height = maxysize;
   from = context->indicator_target;
 
@@ -3173,6 +3166,7 @@ start_indicator (GdkSurface                   *window,
       end_size.height = workarea.height;
       break;
     case GDK_WIN32_AEROSNAP_STATE_FULLUP:
+      start_size.x = end_size.x = window->x;
       end_size.y = 0;
       end_size.height = maxysize;
       break;