Edit Book: Clear the Check Book panel when opening a new book

src/calibre/gui2/tweak_book/boss.py

@@ -285,6 +285,7 @@ def book_opened(self, job):
                                 det_msg=job.traceback, show=True)
         if cn:
             self.save_manager.clear_notify_data()
+        self.gui.check_book.clear()
         dictionaries.clear_ignored(), dictionaries.clear_caches()
         parse_worker.clear()
         container = job.result

src/calibre/gui2/tweak_book/check.py

@@ -100,7 +100,9 @@ def copy_to_clipboard(self):
     def save_state(self):
         tprefs.set('check-book-splitter-state', bytearray(self.saveState()))
 
-    def clear_help(self, msg):
+    def clear_help(self, msg=None):
+        if msg is None:
+            msg = _('No problems found')
         self.help.setText('<h2>%s</h2><p><a style="text-decoration:none" title="%s" href="run:check">%s</a></p>' % (
             msg, _('Click to run a check on the book'), _('Run check')))
 
@@ -207,7 +209,7 @@ def run_checks(self, container):
             self.current_item_changed()
             self.items.setFocus(Qt.OtherFocusReason)
         else:
-            self.clear_help(_('No problems found'))
+            self.clear_help()
 
     def fix_errors(self, container, errors):
         with BusyCursor():
@@ -230,6 +232,10 @@ def keyPressEvent(self, ev):
             self.current_item_activated()
         return super(Check, self).keyPressEvent(ev)
 
+    def clear(self):
+        self.items.clear()
+        self.clear_help()
+
 def main():
     from calibre.gui2 import Application
     from calibre.gui2.tweak_book.boss import get_container