[gnome-text-editor] prefs: add button to clear session history

[Christian Hergert <chergert src gnome org>]

commit cbfe3052d590386e1bf9d56febada17d0b880d05
Author: Christian Hergert <chergert redhat com>
Date:   Fri Jan 28 12:35:07 2022 -0800

    prefs: add button to clear session history
    
    This also moves it closer to the restory session option so that there is
    a bit more continuity between the two features.
    
    Fixes #290

 src/editor-preferences-dialog.ui | 21 +++++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)
---
diff --git a/src/editor-preferences-dialog.ui b/src/editor-preferences-dialog.ui
index f6d33c5..858364c 100644
--- a/src/editor-preferences-dialog.ui
+++ b/src/editor-preferences-dialog.ui
@@ -111,6 +111,13 @@
         <child>
           <object class="AdwPreferencesGroup">
             <property name="title" translatable="yes">Behavior</property>
+            <child>
+              <object class="EditorPreferencesSwitch" id="discover">
+                <property name="title" translatable="yes">Discover Document Settings</property>
+                <property name="subtitle" translatable="yes">Apply settings using modelines, editorconfig, 
or sensible defaults</property>
+                <property name="schema-key">discover-settings</property>
+              </object>
+            </child>
             <child>
               <object class="EditorPreferencesSwitch" id="session">
                 <property name="title" translatable="yes">Restore Session</property>
@@ -119,10 +126,16 @@
               </object>
             </child>
             <child>
-              <object class="EditorPreferencesSwitch" id="discover">
-                <property name="title" translatable="yes">Discover Document Settings</property>
-                <property name="subtitle" translatable="yes">Apply settings using modelines, editorconfig, 
or sensible defaults</property>
-                <property name="schema-key">discover-settings</property>
+              <object class="GtkButton">
+                <property name="action-name">app.clear-history</property>
+                <property name="focus-on-click">false</property>
+                <property name="halign">end</property>
+                <property name="label" translatable="yes">_Clear History</property>
+                <property name="margin-top">24</property>
+                <property name="use-underline">true</property>
+                <style>
+                  <class name="destructive-action"/>
+                </style>
               </object>
             </child>
           </object>