Trigger InsertCompletionHide hook when switching to explicit completion

Previously we would just bypass that hook making it impossible to
act on the inserted text when triggering an explicit completion after
inserting text from the previous completer.

src/insert_completer.cc

@@ -564,7 +564,7 @@ bool InsertCompleter::try_complete(Func complete_func)
     auto& sels = m_context.selections();
     try
     {
-        m_inserted_ranges.clear();
+        reset();
         m_completions = complete_func(sels, m_options, m_faces);
     }
     catch (runtime_error& e)