[gtk: 2/3] placessidebar: Replace hard-coded margins with theme

[Matthias Clasen <matthiasc src gnome org>]

commit 19c2cc1296cd22a4ebeff2cb8aa9d29179bd7bb5
Author: nana-4 <hnmaigo gmail com>
Date:   Sat Aug 15 22:45:39 2020 +0900

    placessidebar: Replace hard-coded margins with theme
    
    So we can easily adjust the widget sizing in the theme.

 gtk/gtkplacessidebar.c         |  3 ---
 gtk/theme/Adwaita/_common.scss | 12 ++++++++++++
 gtk/ui/gtksidebarrow.ui        |  2 --
 3 files changed, 12 insertions(+), 5 deletions(-)
---
diff --git a/gtk/gtkplacessidebar.c b/gtk/gtkplacessidebar.c
index dbe9e81116..d7ac99a788 100644
--- a/gtk/gtkplacessidebar.c
+++ b/gtk/gtkplacessidebar.c
@@ -394,14 +394,11 @@ list_box_header_func (GtkListBoxRow *row,
   else
     {
       before_section_type = SECTION_INVALID;
-      gtk_widget_set_margin_top (GTK_WIDGET (row), 4);
     }
 
   if (before && before_section_type != row_section_type)
     {
       separator = gtk_separator_new (GTK_ORIENTATION_HORIZONTAL);
-      gtk_widget_set_margin_top (separator, 4);
-      gtk_widget_set_margin_bottom (separator, 4);
       gtk_list_box_row_set_header (row, separator);
     }
 }
diff --git a/gtk/theme/Adwaita/_common.scss b/gtk/theme/Adwaita/_common.scss
index bddf62f632..57446f56e6 100644
--- a/gtk/theme/Adwaita/_common.scss
+++ b/gtk/theme/Adwaita/_common.scss
@@ -3389,6 +3389,18 @@ row image.sidebar-icon { opacity: $_placesidebar_icons_opacity; } // dim the sid
 placessidebar, .navigation-sidebar {
   > scrolledwindow.frame { border-style: none; }
 
+  list {
+    padding: 4px 0;
+
+    > row {
+      margin: 1px 0;
+    }
+
+    > separator {
+      margin: 4px 0;
+    }
+  }
+
   row {
     // Needs overriding of the GtkListBoxRow padding
     min-height: 36px;
diff --git a/gtk/ui/gtksidebarrow.ui b/gtk/ui/gtksidebarrow.ui
index 38ecbf3be8..787a478276 100644
--- a/gtk/ui/gtksidebarrow.ui
+++ b/gtk/ui/gtksidebarrow.ui
@@ -1,8 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <interface domain="gtk40">
   <template class="GtkSidebarRow" parent="GtkListBoxRow">
-    <property name="margin-top">1</property>
-    <property name="margin-bottom">1</property>
     <property name="focus-on-click">False</property>
     <style>
       <class name="sidebar-row"/>