gtk 3.22: fix frame borders (#742)

common/gtk-3.0/3.20/gtk-dark.css

@@ -2326,9 +2326,11 @@ frame > border,
   padding: 0;
   border-radius: 0;
   border: 1px solid #2b2e39; }
-  frame > border.flat,
-  .frame.flat {
-    border-style: none; }
+
+frame.flat > border,
+frame > border.flat,
+.frame.flat {
+  border-style: none; }
 
 scrolledwindow viewport.frame {
   border-style: none; }

common/gtk-3.0/3.20/gtk-darker.css

@@ -2325,9 +2325,11 @@ frame > border,
   padding: 0;
   border-radius: 0;
   border: 1px solid #dcdfe3; }
-  frame > border.flat,
-  .frame.flat {
-    border-style: none; }
+
+frame.flat > border,
+frame > border.flat,
+.frame.flat {
+  border-style: none; }
 
 scrolledwindow viewport.frame {
   border-style: none; }

common/gtk-3.0/3.20/gtk-solid-dark.css

@@ -2326,9 +2326,11 @@ frame > border,
   padding: 0;
   border-radius: 0;
   border: 1px solid #2b2e39; }
-  frame > border.flat,
-  .frame.flat {
-    border-style: none; }
+
+frame.flat > border,
+frame > border.flat,
+.frame.flat {
+  border-style: none; }
 
 scrolledwindow viewport.frame {
   border-style: none; }

common/gtk-3.0/3.20/gtk-solid-darker.css

@@ -2325,9 +2325,11 @@ frame > border,
   padding: 0;
   border-radius: 0;
   border: 1px solid #dcdfe3; }
-  frame > border.flat,
-  .frame.flat {
-    border-style: none; }
+
+frame.flat > border,
+frame > border.flat,
+.frame.flat {
+  border-style: none; }
 
 scrolledwindow viewport.frame {
   border-style: none; }

common/gtk-3.0/3.20/gtk-solid.css

@@ -2329,9 +2329,11 @@ frame > border,
   padding: 0;
   border-radius: 0;
   border: 1px solid #dcdfe3; }
-  frame > border.flat,
-  .frame.flat {
-    border-style: none; }
+
+frame.flat > border,
+frame > border.flat,
+.frame.flat {
+  border-style: none; }
 
 scrolledwindow viewport.frame {
   border-style: none; }

common/gtk-3.0/3.20/gtk.css

@@ -2329,9 +2329,11 @@ frame > border,
   padding: 0;
   border-radius: 0;
   border: 1px solid #dcdfe3; }
-  frame > border.flat,
-  .frame.flat {
-    border-style: none; }
+
+frame.flat > border,
+frame > border.flat,
+.frame.flat {
+  border-style: none; }
 
 scrolledwindow viewport.frame {
   border-style: none; }

common/gtk-3.0/3.20/sass/_common.scss

@@ -2402,8 +2402,12 @@ frame > border,
   padding: 0;
   border-radius: 0;
   border: 1px solid $borders_color;
+}
 
-  &.flat { border-style: none; }
+frame.flat > border,
+frame > border.flat,
+.frame.flat {
+  border-style: none;
 }
 
 scrolledwindow {