[gtk+] Adwaita: fix bogus rounded corners on split headerbars

[Lapo Calamandrei <lapo src gnome org>]

commit a64bf81a9fdfbfeabe13298becd5e14fd3dfdd8c
Author: Lapo Calamandrei <calamandrei gmail com>
Date:   Tue Dec 22 11:53:27 2015 +0100

    Adwaita: fix bogus rounded corners on split headerbars
    
    we have to do some assumptions for css selectors limits for this
    particular case, so for split headerbars to work correctly the
    actual haderbars need not to have the titlebar class applied.

 gtk/theme/Adwaita/_common.scss           |   20 ++++++++++++++++++--
 gtk/theme/Adwaita/gtk-contained-dark.css |   17 ++++++++++++++---
 gtk/theme/Adwaita/gtk-contained.css      |   17 ++++++++++++++---
 3 files changed, 46 insertions(+), 8 deletions(-)
---
diff --git a/gtk/theme/Adwaita/_common.scss b/gtk/theme/Adwaita/_common.scss
index fd40259..de2f23e 100644
--- a/gtk/theme/Adwaita/_common.scss
+++ b/gtk/theme/Adwaita/_common.scss
@@ -1086,7 +1086,8 @@ headerbar {
   border-width: 0 0 1px;
   border-style: solid;
   border-color: $borders_color;
-  border-radius: 7px 7px 0 0;
+  border-radius: 0;
+
   background-color: transparent;
 
   @include headerbar_fill;
@@ -1254,13 +1255,28 @@ headerbar {
   }
 }
 
+.titlebar {
+  &, &:backdrop {
+    border-top-left-radius: 7px;
+    border-top-right-radius: 7px;
+  }
+}
+
+headerbar {
+  separator:first-child + &, // tackles the paned container case
+  &:first-child { &, &:backdrop { border-top-left-radius: 7px; }}
+  &:last-child { &, &:backdrop { border-top-right-radius: 7px; }}
+}
+
 .titlebar:not(headerbar) {
   window.csd > & {
     // in csd we assume every titlebar is a headerbar so reset anything, this is needed for split toolbars 
cases
     padding: 0;
-    border-style: none;
+    background-color: transparent;
     background-image: none;
+    border-style: none;
     border-color: transparent;
+    box-shadow: none;
   }
   @extend %titlebar;
 }
diff --git a/gtk/theme/Adwaita/gtk-contained-dark.css b/gtk/theme/Adwaita/gtk-contained-dark.css
index b410f87..13a7b10 100644
--- a/gtk/theme/Adwaita/gtk-contained-dark.css
+++ b/gtk/theme/Adwaita/gtk-contained-dark.css
@@ -1605,7 +1605,7 @@ headerbar {
   border-width: 0 0 1px;
   border-style: solid;
   border-color: #1c1f1f;
-  border-radius: 7px 7px 0 0;
+  border-radius: 0;
   background-color: transparent;
   background-image: linear-gradient(to top, #2a2f2f, #2f3434 2px, #323737 3px);
   box-shadow: inset 0 1px rgba(238, 238, 236, 0.07); }
@@ -1927,11 +1927,22 @@ headerbar {
     .titlebar headerbar.default-decoration button.titlebutton {
       padding: 5px; }
 
+.titlebar, .titlebar:backdrop {
+  border-top-left-radius: 7px;
+  border-top-right-radius: 7px; }
+
+separator:first-child + headerbar, separator:first-child + headerbar:backdrop, headerbar:first-child, 
headerbar:first-child:backdrop {
+  border-top-left-radius: 7px; }
+headerbar:last-child, headerbar:last-child:backdrop {
+  border-top-right-radius: 7px; }
+
 window.csd > .titlebar:not(headerbar) {
   padding: 0;
-  border-style: none;
+  background-color: transparent;
   background-image: none;
-  border-color: transparent; }
+  border-style: none;
+  border-color: transparent;
+  box-shadow: none; }
 
 /************
  * Pathbars *
diff --git a/gtk/theme/Adwaita/gtk-contained.css b/gtk/theme/Adwaita/gtk-contained.css
index 4621e91..fc1734a 100644
--- a/gtk/theme/Adwaita/gtk-contained.css
+++ b/gtk/theme/Adwaita/gtk-contained.css
@@ -1605,7 +1605,7 @@ headerbar {
   border-width: 0 0 1px;
   border-style: solid;
   border-color: #9d9d99;
-  border-radius: 7px 7px 0 0;
+  border-radius: 0;
   background-color: transparent;
   background-image: linear-gradient(to top, #d4d4d2, #efefef 2px, #f4f4f4 3px);
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.8); }
@@ -1927,11 +1927,22 @@ headerbar {
     .titlebar headerbar.default-decoration button.titlebutton {
       padding: 5px; }
 
+.titlebar, .titlebar:backdrop {
+  border-top-left-radius: 7px;
+  border-top-right-radius: 7px; }
+
+separator:first-child + headerbar, separator:first-child + headerbar:backdrop, headerbar:first-child, 
headerbar:first-child:backdrop {
+  border-top-left-radius: 7px; }
+headerbar:last-child, headerbar:last-child:backdrop {
+  border-top-right-radius: 7px; }
+
 window.csd > .titlebar:not(headerbar) {
   padding: 0;
-  border-style: none;
+  background-color: transparent;
   background-image: none;
-  border-color: transparent; }
+  border-style: none;
+  border-color: transparent;
+  box-shadow: none; }
 
 /************
  * Pathbars *