[gtk/wip/carlosg/for-master: 7/8] gtk/window: Bring back L-shaped resize corners

[Carlos Garnacho <carlosg src gnome org>]

commit 612d3bca7d24ab15fa73988cf02d41fd4da5522d
Author: Carlos Garnacho <carlosg gnome org>
Date:   Sat Dec 12 01:32:16 2020 +0100

    gtk/window: Bring back L-shaped resize corners
    
    These ended up square in the various refactors. Make them again L-shaped
    by extending these along the edge being checked. This means we have to
    check for corner positions in all edges, though.

 gtk/gtkwindow.c | 26 +++++++++++++++++++-------
 1 file changed, 19 insertions(+), 7 deletions(-)
---
diff --git a/gtk/gtkwindow.c b/gtk/gtkwindow.c
index c516bcdfc1..d3402c3a84 100644
--- a/gtk/gtkwindow.c
+++ b/gtk/gtkwindow.c
@@ -1309,10 +1309,10 @@ get_edge_for_coordinates (GtkWindow *window,
 
   if (x < left && x >= left - handle_size.left)
     {
-      if (y < top && y >= top - handle_size.top)
+      if (y < top + handle_size.top && y >= top - handle_size.top)
         return edge_or_minus_one (GDK_SURFACE_EDGE_NORTH_WEST);
 
-      if (y > top + border_rect->size.height &&
+      if (y > top + border_rect->size.height - handle_size.bottom &&
           y <= top + border_rect->size.height + handle_size.bottom)
         return edge_or_minus_one (GDK_SURFACE_EDGE_SOUTH_WEST);
 
@@ -1321,24 +1321,36 @@ get_edge_for_coordinates (GtkWindow *window,
   else if (x > left + border_rect->size.width &&
            x <= left + border_rect->size.width + handle_size.right)
     {
-      if (y < top && y >= top - handle_size.top)
+      if (y < top + handle_size.top && y >= top - handle_size.top)
         return edge_or_minus_one (GDK_SURFACE_EDGE_NORTH_EAST);
 
-      if (y > top + border_rect->size.height &&
+      if (y > top + border_rect->size.height - handle_size.bottom &&
           y <= top + border_rect->size.height + handle_size.bottom)
         return edge_or_minus_one (GDK_SURFACE_EDGE_SOUTH_EAST);
 
       return edge_or_minus_one (GDK_SURFACE_EDGE_EAST);
     }
-
-  if (y < top && y >= top - handle_size.top)
+  else if (y < top && y >= top - handle_size.top)
     {
-      /* NORTH_EAST is handled elsewhere */
+      if (x < left + handle_size.left && x >= left - handle_size.left)
+        return edge_or_minus_one (GDK_SURFACE_EDGE_NORTH_WEST);
+
+      if (x > left + border_rect->size.width - handle_size.right &&
+          x <= left + border_rect->size.width + handle_size.right)
+        return edge_or_minus_one (GDK_SURFACE_EDGE_NORTH_EAST);
+
       return edge_or_minus_one (GDK_SURFACE_EDGE_NORTH);
     }
   else if (y > top + border_rect->size.height &&
            y <= top + border_rect->size.height + handle_size.bottom)
     {
+      if (x < left + handle_size.left && x >= left - handle_size.left)
+        return edge_or_minus_one (GDK_SURFACE_EDGE_SOUTH_WEST);
+
+      if (x > left + border_rect->size.width - handle_size.right &&
+          x <= left + border_rect->size.width + handle_size.right)
+        return edge_or_minus_one (GDK_SURFACE_EDGE_SOUTH_EAST);
+
       return edge_or_minus_one (GDK_SURFACE_EDGE_SOUTH);
     }