[gnome-music/wip/exalm/tnum] Use tabular numbers for song duration

[Alexander Mikhaylenko <alexm src gnome org>]

commit e880420a5d18d043f0430fb5401d612aa1fdff04
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Fri Jan 24 23:08:36 2020 +0500

    Use tabular numbers for song duration
    
    Essentially force monospace for digits if the font supports it. This allows
    durations to stay aligned with each other and prevents seekbar changing
    size each second.

 data/ui/PlayerToolbar.ui      | 6 ++++++
 data/ui/SongWidget.ui         | 3 +++
 gnomemusic/views/songsview.py | 4 +++-
 3 files changed, 12 insertions(+), 1 deletion(-)
---
diff --git a/data/ui/PlayerToolbar.ui b/data/ui/PlayerToolbar.ui
index 3eebcf6e..78888f6e 100644
--- a/data/ui/PlayerToolbar.ui
+++ b/data/ui/PlayerToolbar.ui
@@ -204,6 +204,9 @@
             <property name="halign">start</property>
             <property name="valign">center</property>
             <property name="label">0:00</property>
+            <attributes>
+              <attribute name="font-features" value="tnum=1"/>
+            </attributes>
           </object>
           <packing>
             <property name="position">0</property>
@@ -228,6 +231,9 @@
             <property name="halign">start</property>
             <property name="valign">center</property>
             <property name="label">0:00</property>
+            <attributes>
+              <attribute name="font-features" value="tnum=1"/>
+            </attributes>
           </object>
           <packing>
             <property name="position">2</property>
diff --git a/data/ui/SongWidget.ui b/data/ui/SongWidget.ui
index c9fe3496..60d0313c 100644
--- a/data/ui/SongWidget.ui
+++ b/data/ui/SongWidget.ui
@@ -146,6 +146,9 @@
                 <property name="valign">center</property>
                 <property name="hexpand">True</property>
                 <property name="single_line_mode">True</property>
+                <attributes>
+                  <attribute name="font-features" value="tnum=1"/>
+                </attributes>
               </object>
             </child>
           </object>
diff --git a/gnomemusic/views/songsview.py b/gnomemusic/views/songsview.py
index 756635d5..46891d37 100644
--- a/gnomemusic/views/songsview.py
+++ b/gnomemusic/views/songsview.py
@@ -128,7 +128,9 @@ class SongsView(BaseView):
         column_album.props.expand = True
         self._view.append_column(column_album)
 
-        duration_renderer = Gtk.CellRendererText(xalign=1.0)
+        attrs = Pango.AttrList()
+        attrs.insert(Pango.AttrFontFeatures.new("tnum=1"))
+        duration_renderer = Gtk.CellRendererText(xalign=1.0, attributes=attrs)
         column_duration = Gtk.TreeViewColumn(
             "Duration", duration_renderer, text=5)
         self._view.append_column(column_duration)