Preferences: Add Open Folder for debug logs

gajim/data/gui/preferences_window.ui

@@ -2504,9 +2504,14 @@ to discover one from the server. (Example: stun.iptel.org)</property>
                         <property name="position">1</property>
                       </packing>
                     </child>
+                    <child>
+                      <object class="GtkBox">
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <property name="spacing">12</property>
                         <child>
                           <object class="GtkCheckButton" id="enable_logging">
-                        <property name="label" translatable="yes">Enable _debug logging</property>
+                            <property name="label" translatable="yes">Enable _debug logging (restart required)</property>
                             <property name="can_focus">True</property>
                             <property name="receives_default">False</property>
                             <property name="no_show_all">True</property>
@@ -2516,6 +2521,35 @@ to discover one from the server. (Example: stun.iptel.org)</property>
                             <property name="draw_indicator">True</property>
                             <signal name="toggled" handler="on_enable_logging_toggled" swapped="no"/>
                           </object>
+                          <packing>
+                            <property name="expand">False</property>
+                            <property name="fill">True</property>
+                            <property name="position">0</property>
+                          </packing>
+                        </child>
+                        <child>
+                          <object class="GtkButton">
+                            <property name="visible">True</property>
+                            <property name="can_focus">True</property>
+                            <property name="receives_default">True</property>
+                            <property name="tooltip_text" translatable="yes">Opens folder containing debug logs</property>
+                            <property name="use_underline">True</property>
+                            <signal name="clicked" handler="_on_debug_folder_clicked" swapped="no"/>
+                            <child>
+                              <object class="GtkImage">
+                                <property name="visible">True</property>
+                                <property name="can_focus">False</property>
+                                <property name="icon_name">folder-symbolic</property>
+                              </object>
+                            </child>
+                          </object>
+                          <packing>
+                            <property name="expand">False</property>
+                            <property name="fill">True</property>
+                            <property name="position">1</property>
+                          </packing>
+                        </child>
+                      </object>
                       <packing>
                         <property name="expand">False</property>
                         <property name="fill">True</property>

gajim/gtk/preferences.py

@@ -19,6 +19,7 @@ from gi.repository import Gdk
 from gi.repository import Pango
 
 from gajim.common import app
+from gajim.common import configpaths
 from gajim.common import helpers
 from gajim.common import config as c_config
 from gajim.common import idle
@@ -1079,6 +1080,10 @@ class Preferences(Gtk.ApplicationWindow):
     def on_enable_logging_toggled(self, widget):
         app.set_debug_mode(widget.get_active())
 
+    def _on_debug_folder_clicked(self, _widget):
+        debug_folder = configpaths.get('DEBUG')
+        helpers.launch_file_manager(debug_folder)
+
     # Advanced Config Editor (ACE)
     def on_open_advanced_editor_button_clicked(self, _widget):
         window = app.get_app_window(AdvancedConfig)