[gtk/wip/jimmac/tiled-shadow-fix-fix-gtk3] Adwaita: Bring back borders of tiled windows

[Jakub Steiner <jimmac src gnome org>]

commit 35adc7ed0456adcf1c98ad70e9e00b942f8e7d18
Author: Jakub Steiner <jimmac gmail com>
Date:   Thu Feb 11 15:24:59 2021 +0100

    Adwaita: Bring back borders of tiled windows
    
    Fixes https://gitlab.gnome.org/GNOME/gtk/-/issues/3661

 gtk/theme/Adwaita/_common.scss           | 10 ++++++++--
 gtk/theme/Adwaita/gtk-contained-dark.css |  6 +++++-
 gtk/theme/Adwaita/gtk-contained.css      |  6 +++++-
 3 files changed, 18 insertions(+), 4 deletions(-)
---
diff --git a/gtk/theme/Adwaita/_common.scss b/gtk/theme/Adwaita/_common.scss
index 4510cfa784..581da9ef45 100644
--- a/gtk/theme/Adwaita/_common.scss
+++ b/gtk/theme/Adwaita/_common.scss
@@ -4574,12 +4574,18 @@ decoration {
   }
 
   .maximized &,
-  .fullscreen &,
+  .fullscreen & { border-radius: 0; box-shadow: none; }
+
   .tiled &,
   .tiled-top &,
   .tiled-right &,
   .tiled-bottom &,
-  .tiled-left & { border-radius: 0; box-shadow: none; }
+  .tiled-left & {
+    border-radius: 0;
+    box-shadow: 0 0 0 1px $_wm_border_backdrop;
+
+    &:backdrop { box-shadow: 0 0 0 1px $_wm_border_backdrop; }
+   }
 
   .popup & { box-shadow: none; }
 
diff --git a/gtk/theme/Adwaita/gtk-contained-dark.css b/gtk/theme/Adwaita/gtk-contained-dark.css
index a0e94dc079..9bb4c1c2fb 100644
--- a/gtk/theme/Adwaita/gtk-contained-dark.css
+++ b/gtk/theme/Adwaita/gtk-contained-dark.css
@@ -1838,7 +1838,11 @@ decoration { border-radius: 8px 8px 0 0; border-width: 0px; box-shadow: 0 3px 9p
 
 decoration:backdrop { box-shadow: 0 3px 9px 1px transparent, 0 2px 6px 2px rgba(0, 0, 0, 0.2), 0 0 0 1px 
rgba(27, 27, 27, 0.9); transition: 200ms ease-out; }
 
-.maximized decoration, .fullscreen decoration, .tiled decoration, .tiled-top decoration, .tiled-right 
decoration, .tiled-bottom decoration, .tiled-left decoration { border-radius: 0; box-shadow: none; }
+.maximized decoration, .fullscreen decoration { border-radius: 0; box-shadow: none; }
+
+.tiled decoration, .tiled-top decoration, .tiled-right decoration, .tiled-bottom decoration, .tiled-left 
decoration { border-radius: 0; box-shadow: 0 0 0 1px rgba(27, 27, 27, 0.9); }
+
+.tiled decoration:backdrop, .tiled-top decoration:backdrop, .tiled-right decoration:backdrop, .tiled-bottom 
decoration:backdrop, .tiled-left decoration:backdrop { box-shadow: 0 0 0 1px rgba(27, 27, 27, 0.9); }
 
 .popup decoration { box-shadow: none; }
 
diff --git a/gtk/theme/Adwaita/gtk-contained.css b/gtk/theme/Adwaita/gtk-contained.css
index 56b3af7641..6a429b32f3 100644
--- a/gtk/theme/Adwaita/gtk-contained.css
+++ b/gtk/theme/Adwaita/gtk-contained.css
@@ -1854,7 +1854,11 @@ decoration { border-radius: 8px 8px 0 0; border-width: 0px; box-shadow: 0 3px 9p
 
 decoration:backdrop { box-shadow: 0 3px 9px 1px transparent, 0 2px 6px 2px rgba(0, 0, 0, 0.2), 0 0 0 1px 
rgba(0, 0, 0, 0.18); transition: 200ms ease-out; }
 
-.maximized decoration, .fullscreen decoration, .tiled decoration, .tiled-top decoration, .tiled-right 
decoration, .tiled-bottom decoration, .tiled-left decoration { border-radius: 0; box-shadow: none; }
+.maximized decoration, .fullscreen decoration { border-radius: 0; box-shadow: none; }
+
+.tiled decoration, .tiled-top decoration, .tiled-right decoration, .tiled-bottom decoration, .tiled-left 
decoration { border-radius: 0; box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.18); }
+
+.tiled decoration:backdrop, .tiled-top decoration:backdrop, .tiled-right decoration:backdrop, .tiled-bottom 
decoration:backdrop, .tiled-left decoration:backdrop { box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.18); }
 
 .popup decoration { box-shadow: none; }