[gnome-contacts] Window: add tooltips to icon buttons.

[Niels De Graef <nielsdg src gnome org>]

commit a67d47d0ad148d7994660bba16cd78f74ee954ed
Author: Niels De Graef <nielsdegraef gmail com>
Date:   Sun Jan 21 22:01:08 2018 +0100

    Window: add tooltips to icon buttons.

 data/ui/contacts-window.ui |    6 +++---
 src/contacts-window.vala   |    2 ++
 2 files changed, 5 insertions(+), 3 deletions(-)
---
diff --git a/data/ui/contacts-window.ui b/data/ui/contacts-window.ui
index 7571709..cef3289 100644
--- a/data/ui/contacts-window.ui
+++ b/data/ui/contacts-window.ui
@@ -30,15 +30,13 @@
                 <property name="can_focus">True</property>
                 <property name="halign">center</property>
                 <property name="valign">center</property>
+                <property name="tooltip_text" translatable="yes">Create new contact</property>
                 <signal name="clicked" handler="new_contact" object="ContactsWindow" after="no" 
swapped="no"/>
                 <child internal-child="accessible">
                   <object class="AtkObject" id="add_button_atkobject">
                     <property name="AtkObject::accessible-name" translatable="yes">Add contact</property>
                   </object>
                 </child>
-                <style>
-                  <class name="image-button"/>
-                </style>
                 <child>
                   <object class="GtkImage">
                     <property name="visible">True</property>
@@ -57,6 +55,7 @@
                 <property name="visible">False</property>
                 <property name="can_focus">True</property>
                 <property name="focus_on_click">False</property>
+                <property name="tooltip_text" translatable="yes">Cancel selection</property>
                 <child>
                   <object class="GtkImage">
                     <property name="visible">True</property>
@@ -103,6 +102,7 @@
                 <property name="can_focus">True</property>
                 <property name="focus_on_click">False</property>
                 <property name="valign">center</property>
+                <property name="tooltip_text" translatable="yes">Edit details</property>
                 <signal name="clicked" handler="on_edit_button_clicked"/>
                 <child>
                   <object class="GtkImage">
diff --git a/src/contacts-window.vala b/src/contacts-window.vala
index 36393c9..057d9a0 100644
--- a/src/contacts-window.vala
+++ b/src/contacts-window.vala
@@ -209,6 +209,8 @@ public class Contacts.Window : Gtk.ApplicationWindow {
       this.ignore_favorite_button_toggled = true;
       this.favorite_button.active = c.individual.is_favourite;
       this.ignore_favorite_button_toggled = false;
+      this.favorite_button.tooltip_text = (c.individual.is_favourite)? _("Unmark as favorite")
+                                                                     : _("Mark as favorite");
       this.right_header.title = c.display_name;
     }
   }