Fixes: - Unhighlight search results when search filter changes

Task:     - 237668

src/plugins/find/currentdocumentfind.cpp

@@ -150,6 +150,8 @@ void CurrentDocumentFind::updateCurrentFindFilter(QWidget *old, QWidget *now)
     if (!impl)
         return;
     removeFindSupportConnections();
+    if (m_currentFind)
+        m_currentFind->highlightAll(QString(), 0);
     m_currentWidget = candidate;
     m_currentFind = impl;
     if (m_currentFind) {