connect toggle for time diff plugin

src/plugins/timediffplugin.py

@@ -4,6 +4,7 @@ from PySide6.QtGui import QIcon
 
 from src.pluginbase import PluginBase
 from src.plugins.domain.raction import RAction
+from src.plugins.logfile.filterwidget import FilterWidget
 from src.plugins.logfile.preprocesslineshook import PreProcessLinesHook
 from src.plugins.timediff.time_diff_pre_process_lines_hook import TimeDiffPreProcessLinesHook
 from src.i18n import _
@@ -15,6 +16,7 @@ class TimeDiffPlugin(PluginBase):
         self.time_diff_state = False
         self.time_diff_action = RAction(_(""), lambda: self._toggle_time_diff(),
                                         icon_file="icons/ionicons/stopwatch-outline.svg", checkable=True)
+        self.time_diff_hook = TimeDiffPreProcessLinesHook()
 
     def copy(self):
         return TimeDiffPlugin()
@@ -26,9 +28,10 @@ class TimeDiffPlugin(PluginBase):
 
     def get_pre_process_lines_hook(self) -> Optional[PreProcessLinesHook]:
         if self.time_diff_state:
-            return TimeDiffPreProcessLinesHook()
-        return None
+            return self.time_diff_hook
+        return self.time_diff_hook
 
     def _toggle_time_diff(self):
         self.time_diff_state = not self.time_diff_state
         self.time_diff_action.set_checked(self.time_diff_state)
+        self.time_diff_hook.active = self.time_diff_state