[gnome-calculator] Make the conversion labels selectable

[Robert Roth <robertroth src gnome org>]

commit 0f213196d593047a2f851db160780e2bce251ed3
Author: Robert Roth <robert roth off gmail com>
Date:   Sun Oct 18 10:03:59 2020 +0300

    Make the conversion labels selectable

 src/ui/math-converter.ui | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/src/ui/math-converter.ui b/src/ui/math-converter.ui
index 9ec03820..88c6c8d8 100644
--- a/src/ui/math-converter.ui
+++ b/src/ui/math-converter.ui
@@ -87,6 +87,7 @@
           <object class="GtkLabel" id="from_label">
             <property name="visible">True</property>
             <property name="sensitive">True</property>
+            <property name="selectable">True</property>
             <property name="can_focus">False</property>
             <property name="halign">start</property>
             <property name="valign">center</property>
@@ -116,6 +117,7 @@
           <object class="GtkLabel" id="to_label">
             <property name="visible">True</property>
             <property name="sensitive">True</property>
+            <property name="selectable">True</property>
             <property name="can_focus">False</property>
             <property name="halign">end</property>
             <property name="valign">center</property>