[gnome-calculator] Make the calculator window resizable (bgo#756920)

[Robert Roth <robertroth src gnome org>]

commit 6d1906c78e41de37e37e401bcbf5c398298aab61
Author: Robert Roth <robert roth off gmail com>
Date:   Tue Jan 23 23:54:07 2018 +0200

    Make the calculator window resizable (bgo#756920)

 src/history-view.ui  |    1 +
 src/math-window.ui   |    2 +-
 src/math-window.vala |    2 --
 3 files changed, 2 insertions(+), 3 deletions(-)
---
diff --git a/src/history-view.ui b/src/history-view.ui
index d2a87ad..18008b3 100644
--- a/src/history-view.ui
+++ b/src/history-view.ui
@@ -14,6 +14,7 @@
       <object class="GtkViewport" id="viewport">
         <property name="visible">True</property>
         <property name="can_focus">False</property>
+        <property name="hexpand">True</property>
         <child>
           <object class="GtkListBox" id="listbox">
             <property name="visible">True</property>
diff --git a/src/math-window.ui b/src/math-window.ui
index b5f581a..5d6e97e 100644
--- a/src/math-window.ui
+++ b/src/math-window.ui
@@ -47,7 +47,7 @@
     <property name="can_focus">False</property>
     <property name="title" translatable="yes">Calculator</property>
     <property name="role">gnome-calculator</property>
-    <property name="resizable">False</property>
+    <property name="resizable">True</property>
     <property name="show_menubar">False</property>
     <child>
       <object class="GtkGrid" id="grid">
diff --git a/src/math-window.vala b/src/math-window.vala
index 53f12a1..e8b4ac1 100644
--- a/src/math-window.vala
+++ b/src/math-window.vala
@@ -109,14 +109,12 @@ public class MathWindow : Gtk.ApplicationWindow
             _buttons.show ();
             remove_buttons = false;
             converter.hide ();
-            resizable = false;
         }
         else if (remove_buttons == false && _buttons.mode == ButtonMode.KEYBOARD)
         {
             _buttons.hide ();
             remove_buttons = true;
             converter.show ();
-            resizable = true;
         }
     }