[simple-scan] Fix preferences mnemnonics

[Robert Ancell <rancell src gnome org>]

commit 98ab7b86e75a938888b0ac39b21ed5db396ae995
Author: Robert Ancell <robert ancell canonical com>
Date:   Mon Jan 6 10:46:45 2020 +1300

    Fix preferences mnemnonics
    
    Set mnemonic widgets explicitly, as they don't seem to be automatically working anymore.
    Restore mnemonics removed in 5e4f532.
    Add new mnemonics.

 src/preferences-dialog.ui | 28 ++++++++++++++++++----------
 1 file changed, 18 insertions(+), 10 deletions(-)
---
diff --git a/src/preferences-dialog.ui b/src/preferences-dialog.ui
index a578d71..c516222 100644
--- a/src/preferences-dialog.ui
+++ b/src/preferences-dialog.ui
@@ -69,9 +69,9 @@
                     <child>
                       <object class="GtkLabel" id="page_side_label">
                         <property name="visible">True</property>
-                        <property name="label" translatable="yes" comments="Label beside scan side combo 
box">Scan Sides</property>
+                        <property name="label" translatable="yes" comments="Label beside scan side combo 
box">Scan _Sides</property>
                         <property name="use_underline">True</property>
-                        <property name="mnemonic_widget">scan_side_box</property>
+                        <property name="mnemonic_widget">front_side_button</property>
                         <property name="xalign">1</property>
                         <style>
                           <class name="dim-label"/>
@@ -85,8 +85,9 @@
                     <child>
                       <object class="GtkLabel" id="paper_size_label">
                         <property name="visible">True</property>
-                        <property name="label" translatable="yes" comments="Label beside page size combo 
box">Page Size</property>
+                        <property name="label" translatable="yes" comments="Label beside page size combo 
box">_Page Size</property>
                         <property name="use_underline">True</property>
+                        <property name="mnemonic_widget">paper_size_combo</property>
                         <property name="xalign">1</property>
                         <style>
                           <class name="dim-label"/>
@@ -161,8 +162,9 @@
                     <child>
                       <object class="GtkLabel" id="page_delay_label">
                         <property name="visible">True</property>
-                        <property name="label" translatable="yes" comments="Label beside page delay 
scale">Delay</property>
+                        <property name="label" translatable="yes" comments="Label beside page delay 
scale">_Delay</property>
                         <property name="use_underline">True</property>
+                        <property name="mnemonic_widget">page_delay_3s_button</property>
                         <property name="xalign">1</property>
                         <style>
                           <class name="dim-label"/>
@@ -280,7 +282,8 @@
             <child type="tab">
               <object class="GtkLabel">
                 <property name="visible">True</property>
-                <property name="label" translatable="yes" comments="Preferences Dialog: Tab label for 
scanning settings">Scanning</property>
+                <property name="label" translatable="yes" comments="Preferences Dialog: Tab label for 
scanning settings">_Scanning</property>
+                <property name="use_underline">True</property>
               </object>
               <packing>
                 <property name="tab_fill">False</property>
@@ -300,8 +303,9 @@
                     <child>
                       <object class="GtkLabel" id="text_dpi_label">
                         <property name="visible">True</property>
-                        <property name="label" translatable="yes" comments="Label beside scan resolution 
combo box">Text Resolution</property>
+                        <property name="label" translatable="yes" comments="Label beside scan resolution 
combo box">_Text Resolution</property>
                         <property name="use_underline">True</property>
+                        <property name="mnemonic_widget">text_dpi_combo</property>
                         <property name="xalign">1</property>
                         <style>
                           <class name="dim-label"/>
@@ -315,8 +319,9 @@
                     <child>
                       <object class="GtkLabel" id="photo_dpi_label">
                         <property name="visible">True</property>
-                        <property name="label" translatable="yes" comments="Label beside scan resolution 
combo box">Photo Resolution</property>
+                        <property name="label" translatable="yes" comments="Label beside scan resolution 
combo box">_Photo Resolution</property>
                         <property name="use_underline">True</property>
+                        <property name="mnemonic_widget">photo_dpi_combo</property>
                         <property name="xalign">1</property>
                         <style>
                           <class name="dim-label"/>
@@ -359,8 +364,9 @@
                     <child>
                       <object class="GtkLabel" id="brightness_label">
                         <property name="visible">True</property>
-                        <property name="label" translatable="yes" comments="Label beside brightness 
scale">Brightness</property>
+                        <property name="label" translatable="yes" comments="Label beside brightness 
scale">_Brightness</property>
                         <property name="use_underline">True</property>
+                        <property name="mnemonic_widget">brightness_scale</property>
                         <property name="xalign">1</property>
                         <style>
                           <class name="dim-label"/>
@@ -374,8 +380,9 @@
                     <child>
                       <object class="GtkLabel" id="contrast_label">
                         <property name="visible">True</property>
-                        <property name="label" translatable="yes" comments="Label beside contrast 
scale">Contrast</property>
+                        <property name="label" translatable="yes" comments="Label beside contrast 
scale">_Contrast</property>
                         <property name="use_underline">True</property>
+                        <property name="mnemonic_widget">contrast_scale</property>
                         <property name="xalign">1</property>
                         <style>
                           <class name="dim-label"/>
@@ -422,7 +429,8 @@
             <child type="tab">
               <object class="GtkLabel">
                 <property name="visible">True</property>
-                <property name="label" translatable="yes" comments="Preferences Dialog: Tab for quality 
settings">Quality</property>
+                <property name="label" translatable="yes" comments="Preferences Dialog: Tab for quality 
settings">_Quality</property>
+                <property name="use_underline">True</property>
               </object>
               <packing>
                 <property name="tab_fill">False</property>