[gnome-control-center] Add missing a11y labels

[Robert Ancell <rancell src gnome org>]

commit 98fcce2202abd4a4108f02418db43fb20a347e59
Author: Lukáš Tyrychtr <lukastyrychtr gmail com>
Date:   Mon Jun 6 14:05:05 2022 +0200

    Add missing a11y labels

 panels/sound/cc-balance-slider.ui   |  3 +++
 panels/sound/cc-fade-slider.ui      |  3 +++
 panels/sound/cc-sound-panel.ui      | 15 +++++++++++++++
 panels/sound/cc-subwoofer-slider.ui |  3 +++
 panels/sound/cc-volume-slider.ui    |  6 ++++++
 5 files changed, 30 insertions(+)
---
diff --git a/panels/sound/cc-balance-slider.ui b/panels/sound/cc-balance-slider.ui
index 5e70da024..871a9150e 100644
--- a/panels/sound/cc-balance-slider.ui
+++ b/panels/sound/cc-balance-slider.ui
@@ -9,6 +9,9 @@
         <property name="draw_value">False</property>
         <property name="has_origin">False</property>
         <property name="adjustment">adjustment</property>
+        <accessibility>
+          <property name="label" translatable="yes">Balance</property>
+        </accessibility>
         <marks>
           <mark value="-1" translatable="yes">Left</mark>
           <mark value="0"/>
diff --git a/panels/sound/cc-fade-slider.ui b/panels/sound/cc-fade-slider.ui
index 1d01c31f3..97984fbdb 100644
--- a/panels/sound/cc-fade-slider.ui
+++ b/panels/sound/cc-fade-slider.ui
@@ -9,6 +9,9 @@
         <property name="draw_value">False</property>
         <property name="has_origin">False</property>
         <property name="adjustment">adjustment</property>
+        <accessibility>
+          <property name="label" translatable="yes">Fade</property>
+        </accessibility>
         <marks>
           <mark value="-1" translatable="yes">Rear</mark>
           <mark value="0"/>
diff --git a/panels/sound/cc-sound-panel.ui b/panels/sound/cc-sound-panel.ui
index dadf96a40..33b6dbb9e 100644
--- a/panels/sound/cc-sound-panel.ui
+++ b/panels/sound/cc-sound-panel.ui
@@ -8,6 +8,9 @@
             <property name="title" translatable="yes">System Volume</property>
             <child>
               <object class="AdwPreferencesRow">
+                <accessibility>
+                  <property name="label" translatable="yes">Master volume</property>
+                </accessibility>
                 <child>
                   <object class="CcVolumeSlider" id="output_volume_slider">
                     <property name="margin-top">12</property>
@@ -67,6 +70,9 @@
                                 <child>
                                   <object class="CcDeviceComboBox" id="output_device_combo_box">
                                     <property name="hexpand">True</property>
+                                    <accessibility>
+                                      <relation name="labelled-by">output_device_label</relation>
+                                    </accessibility>
                                     <signal name="changed" handler="output_device_changed_cb" 
object="CcSoundPanel" swapped="yes"/>
                                   </object>
                                 </child>
@@ -110,6 +116,9 @@
                             <child>
                               <object class="CcProfileComboBox" id="output_profile_combo_box">
                                 <property name="hexpand">True</property>
+                                <accessibility>
+                                  <relation name="labelled-by">output_configuration_label</relation>
+                                </accessibility>
                               </object>
                             </child>
                           </object>
@@ -234,6 +243,9 @@
                             <child>
                               <object class="CcDeviceComboBox" id="input_device_combo_box">
                                 <property name="hexpand">True</property>
+                                <accessibility>
+                                  <relation name="labelled-by">input_device_label</relation>
+                                </accessibility>
                                 <signal name="changed" handler="input_device_changed_cb" 
object="CcSoundPanel" swapped="yes"/>
                               </object>
                             </child>
@@ -269,6 +281,9 @@
                             <child>
                               <object class="CcProfileComboBox" id="input_profile_combo_box">
                                 <property name="hexpand">True</property>
+                                <accessibility>
+                                  <relation name="labelled-by">input_configuration_label</relation>"
+                                </accessibility>
                               </object>
                             </child>
                           </object>
diff --git a/panels/sound/cc-subwoofer-slider.ui b/panels/sound/cc-subwoofer-slider.ui
index 5a744fcfd..057da4baf 100644
--- a/panels/sound/cc-subwoofer-slider.ui
+++ b/panels/sound/cc-subwoofer-slider.ui
@@ -9,6 +9,9 @@
         <property name="draw_value">False</property>
         <property name="has_origin">False</property>
         <property name="adjustment">adjustment</property>
+        <accessibility>
+          <property name="label" translatable="yes">Subwoofer</property>
+        </accessibility>
       </object>
     </child>
   </template>
diff --git a/panels/sound/cc-volume-slider.ui b/panels/sound/cc-volume-slider.ui
index 2a07a1fa4..f6f0e8eae 100644
--- a/panels/sound/cc-volume-slider.ui
+++ b/panels/sound/cc-volume-slider.ui
@@ -9,11 +9,17 @@
         <property name="adjustment">volume_adjustment</property>
         <property name="draw_value">False</property>
         <property name="hexpand">True</property>
+        <accessibility>
+          <property name="label" translatable="yes">Volume</property>
+        </accessibility>
       </object>
     </child>
     <child>
       <object class="GtkToggleButton" id="mute_button">
         <property name="visible">True</property>
+        <accessibility>
+          <property name="label" translatable="yes">Mute</property>
+        </accessibility>
         <signal name="toggled" handler="mute_button_toggled_cb" object="CcVolumeSlider" swapped="yes"/>
         <style>
           <class name="flat" />