E-book viewer: Allow clearing list of recently opened books from the open button's popup menu itself. Fixes #2034760 [[Enhancement] E-book viewer: "Open e-book" toolbar button should have a "Clear recent list" item](https://bugs.launchpad.net/calibre/+bug/2034760)

src/calibre/gui2/viewer/toolbars.py

@@ -328,6 +328,12 @@ class ActionsToolBar(ToolBar):
                         self.open_book_at_path.emit, path))
                 else:
                     self.web_view.remove_recently_opened(path)
+        if len(m.actions()) > 0:
+            m.addSeparator()
+            m.addAction(_('Clear list of recently opened books'), self.clear_recently_opened)
+
+    def clear_recently_opened(self):
+        self.web_view.remove_recently_opened()
 
     def on_view_created(self, data):
         self.default_color_schemes = data['default_color_schemes']

src/calibre/gui2/viewer/web_view.py

@@ -748,5 +748,5 @@ class WebView(RestartingWebEngineView):
     def repair_after_fullscreen_switch(self):
         self.execute_when_ready('repair_after_fullscreen_switch')
 
-    def remove_recently_opened(self, path):
+    def remove_recently_opened(self, path=''):
         self.generic_action('remove-recently-opened', {'path': path})

src/pyj/read_book/open_book.pyj

@@ -81,6 +81,7 @@ def remove_recently_opened(path):
     sd = get_session_data()
     rl = sd.get('standalone_recently_opened')
     newl = v'[]'
+    if path:
         for entry in rl:
             if entry.key is not path:
                 newl.push(entry)