ui,stats: highlight filter line if there's a filter

Closes: #1419

Author: gustavo-iniguez-goya

ui/opensnitch/dialogs/stats.py

@@ -1813,6 +1813,8 @@ def _cb_table_header_clicked(self, pos, sortIdx):
         self.setQuery(model, q)
 
     def _cb_events_filter_line_changed(self, text):
+        self.set_filter_line_color(text)
+
         cur_idx = self.tabWidget.currentIndex()
 
         model = self.TABLES[cur_idx]['view'].model()
@@ -2498,6 +2500,12 @@ def _get_rule(self, rule_name, node_name):
 
         return records
 
+    def set_filter_line_color(self, text):
+        if text == "":
+            self.filterLine.setStyleSheet('')
+        else:
+            self.filterLine.setStyleSheet('background-color: #55ff7f')
+
     def _get_filter_line_clause(self, idx, text):
         if text == "":
             return ""