diff --git a/src/calibre/gui2/tweak_book/boss.py b/src/calibre/gui2/tweak_book/boss.py
index 158aaa67ed..9ee56eca72 100644
--- a/src/calibre/gui2/tweak_book/boss.py
+++ b/src/calibre/gui2/tweak_book/boss.py
@@ -394,51 +394,6 @@ class Boss(QObject):
         d.resize(600, 400)
         d.exec_()
 
-    def create_diff_dialog(self, revert_msg=_('&Revert changes'), show_open_in_editor=True):
-        global _diff_dialogs
-        from calibre.gui2.tweak_book.diff.main import Diff
-        def line_activated(name, lnum, right):
-            if right:
-                self.edit_file_requested(name, None, guess_type(name))
-                if name in editors:
-                    editor = editors[name]
-                    editor.go_to_line(lnum)
-                    editor.setFocus(Qt.OtherFocusReason)
-                    self.gui.raise_()
-        d = Diff(revert_button_msg=revert_msg, show_open_in_editor=show_open_in_editor)
-        [x.break_cycles() for x in _diff_dialogs if not x.isVisible()]
-        _diff_dialogs = [x for x in _diff_dialogs if x.isVisible()] + [d]
-        d.show(), d.raise_(), d.setFocus(Qt.OtherFocusReason), d.setWindowModality(Qt.NonModal)
-        if show_open_in_editor:
-            d.line_activated.connect(line_activated)
-        return d
-
-    def show_current_diff(self, allow_revert=True, to_container=None):
-        self.commit_all_editors_to_container()
-        d = self.create_diff_dialog()
-        d.revert_requested.connect(partial(self.revert_requested, self.global_undo.previous_container))
-        d.container_diff(to_container or self.global_undo.previous_container, self.global_undo.current_container)
-
-    def compare_book(self):
-        self.commit_all_editors_to_container()
-        c = current_container()
-        path = choose_files(self.gui, 'select-book-for-comparison', _('Choose book'), filters=[
-            (_('%s books') % c.book_type.upper(), (c.book_type,))], select_only_single_file=True, all_files=False)
-        if path and path[0]:
-            with TemporaryDirectory('_compare') as tdir:
-                other = _gc(path[0], tdir=tdir, tweak_mode=True)
-                d = self.create_diff_dialog(revert_msg=None)
-                d.container_diff(other, c)
-
-    def revert_requested(self, container):
-        self.commit_all_editors_to_container()
-        nc = self.global_undo.revert_to(container)
-        set_current_container(nc)
-        self.apply_container_update_to_gui()
-
-    def compare_requested(self, container):
-        self.show_current_diff(to_container=container)
-
     # Renaming {{{
 
     def rationalize_folders(self):
@@ -539,6 +494,52 @@ class Boss(QObject):
         if container is not None:
             set_current_container(container)
             self.update_global_history_actions()
+
+    def create_diff_dialog(self, revert_msg=_('&Revert changes'), show_open_in_editor=True):
+        global _diff_dialogs
+        from calibre.gui2.tweak_book.diff.main import Diff
+        def line_activated(name, lnum, right):
+            if right:
+                self.edit_file_requested(name, None, guess_type(name))
+                if name in editors:
+                    editor = editors[name]
+                    editor.go_to_line(lnum)
+                    editor.setFocus(Qt.OtherFocusReason)
+                    self.gui.raise_()
+        d = Diff(revert_button_msg=revert_msg, show_open_in_editor=show_open_in_editor)
+        [x.break_cycles() for x in _diff_dialogs if not x.isVisible()]
+        _diff_dialogs = [x for x in _diff_dialogs if x.isVisible()] + [d]
+        d.show(), d.raise_(), d.setFocus(Qt.OtherFocusReason), d.setWindowModality(Qt.NonModal)
+        if show_open_in_editor:
+            d.line_activated.connect(line_activated)
+        return d
+
+    def show_current_diff(self, allow_revert=True, to_container=None):
+        self.commit_all_editors_to_container()
+        d = self.create_diff_dialog()
+        d.revert_requested.connect(partial(self.revert_requested, self.global_undo.previous_container))
+        d.container_diff(to_container or self.global_undo.previous_container, self.global_undo.current_container)
+
+    def compare_book(self):
+        self.commit_all_editors_to_container()
+        c = current_container()
+        path = choose_files(self.gui, 'select-book-for-comparison', _('Choose book'), filters=[
+            (_('%s books') % c.book_type.upper(), (c.book_type,))], select_only_single_file=True, all_files=False)
+        if path and path[0]:
+            with TemporaryDirectory('_compare') as tdir:
+                other = _gc(path[0], tdir=tdir, tweak_mode=True)
+                d = self.create_diff_dialog(revert_msg=None)
+                d.container_diff(other, c)
+
+    def revert_requested(self, container):
+        self.commit_all_editors_to_container()
+        nc = self.global_undo.revert_to(container)
+        set_current_container(nc)
+        self.apply_container_update_to_gui()
+
+    def compare_requested(self, container):
+        self.show_current_diff(to_container=container)
+
     # }}}
 
     def set_modified(self):