[gnome-control-center] printers: Set mnemonic widget for labels

[Felipe Borges <felipeborges src gnome org>]

commit 61470a2a01d72019c7377f4133c3d6b9e82a0edd
Author: Jeremy Bicha <jbicha ubuntu com>
Date:   Thu Jan 3 15:58:30 2019 -0500

    printers: Set mnemonic widget for labels
    
    This allows screen readers to read the label for each widget.

 panels/printers/details-dialog.ui   | 4 ++++
 panels/printers/pp-options-dialog.c | 2 ++
 2 files changed, 6 insertions(+)
---
diff --git a/panels/printers/details-dialog.ui b/panels/printers/details-dialog.ui
index 4524d1406..db2433dcd 100644
--- a/panels/printers/details-dialog.ui
+++ b/panels/printers/details-dialog.ui
@@ -37,6 +37,7 @@
               <object class="GtkLabel">
                 <property name="label" translatable="yes">Name</property>
                 <property name="halign">end</property>
+                <property name="mnemonic_widget">printer_name_entry</property>
                 <style>
                   <class name="dim-label"/>
                 </style>
@@ -62,6 +63,7 @@
               <object class="GtkLabel">
                 <property name="label" translatable="yes">Location</property>
                 <property name="halign">end</property>
+                <property name="mnemonic_widget">printer_location_entry</property>
                 <style>
                   <class name="dim-label"/>
                 </style>
@@ -86,6 +88,7 @@
               <object class="GtkLabel">
                 <property name="label" translatable="yes">Address</property>
                 <property name="halign">end</property>
+                <property name="mnemonic_widget">printer_address_label</property>
                 <style>
                   <class name="dim-label"/>
                 </style>
@@ -110,6 +113,7 @@
               <object class="GtkLabel">
                 <property name="label" translatable="yes">Driver</property>
                 <property name="halign">end</property>
+                <property name="mnemonic_widget">printer_model_label</property>
                 <style>
                   <class name="dim-label"/>
                 </style>
diff --git a/panels/printers/pp-options-dialog.c b/panels/printers/pp-options-dialog.c
index f789dd986..c3773e7f8 100644
--- a/panels/printers/pp-options-dialog.c
+++ b/panels/printers/pp-options-dialog.c
@@ -350,6 +350,7 @@ ipp_option_add (IPPAttribute *attr_supported,
       position = grid_get_height (grid);
 
       label = gtk_label_new (option_display_name);
+      gtk_label_set_mnemonic_widget (label, widget);
       context = gtk_widget_get_style_context (label);
       gtk_style_context_add_class (context, "dim-label");
       gtk_widget_set_halign (label, GTK_ALIGN_END);
@@ -382,6 +383,7 @@ ppd_option_add (ppd_option_t  option,
       position = grid_get_height (grid);
 
       label = gtk_label_new (ppd_option_name_translate (&option));
+      gtk_label_set_mnemonic_widget (label, widget);
       context = gtk_widget_get_style_context (label);
       gtk_style_context_add_class (context, "dim-label");
       gtk_widget_set_halign (label, GTK_ALIGN_END);