[geary] Make copying a message subject much more likely to work. Bug 788494.

[Michael Gratton <mjog src gnome org>]

commit 360e5a094cb77d07cfd91bbe7eebf9c33723fc45
Author: Michael James Gratton <mike vee net>
Date:   Mon Feb 5 22:30:36 2018 +1100

    Make copying a message subject much more likely to work. Bug 788494.
    
    * ui/conversation-message.ui: Make subject label focusable so if clicked
      on, its default keyboard bindings will Just Work.

 ui/conversation-message.ui |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/ui/conversation-message.ui b/ui/conversation-message.ui
index 8e6a1b3..f61f73c 100644
--- a/ui/conversation-message.ui
+++ b/ui/conversation-message.ui
@@ -286,7 +286,7 @@
                         <child>
                           <object class="GtkLabel" id="subject">
                             <property name="visible">True</property>
-                            <property name="can_focus">False</property>
+                            <property name="can_focus">True</property>
                             <property name="halign">start</property>
                             <property name="hexpand">True</property>
                             <property name="label" translatable="yes">Subject</property>