[url] fix some url opening issues

src/lnav_commands.cc

@@ -3118,6 +3118,7 @@ com_open(exec_context& ec, std::string cmdline, std::vector<std::string>& args)
                     lnav_data.ld_active_files.fc_file_names[ul->get_path()]
                         .with_filename(fn)
                         .with_init_location(file_loc);
+                    lnav_data.ld_active_files.fc_files_generation += 1;
                     isc::to<curl_looper&, services::curl_streamer_t>().send(
                         [ul](auto& clooper) { clooper.add_request(ul); });
                     lnav_data.ld_files_to_front.emplace_back(fn, file_loc);

src/textfile_sub_source.cc

@@ -882,6 +882,7 @@ textfile_sub_source::rescan_files(textfile_sub_source::scan_callback& callback,
                     if ((st.st_mtime != ms_iter->second.ms_mtime
                          || st.st_size != ms_iter->second.ms_file_size)
                         && (st.st_size < 10 * 1024
+                            || ms_iter->second.ms_file_size == 0
                             || !ms_iter->second.ms_metadata.m_sections_tree
                                     .empty()))
                     {
@@ -921,7 +922,7 @@ textfile_sub_source::rescan_files(textfile_sub_source::scan_callback& callback,
                         this->tss_doc_metadata[lf->get_filename()]
                             = metadata_state{
                                 st.st_mtime,
-                                static_cast<file_ssize_t>(lf->get_index_size()),
+                                lf->get_index_size(),
                                 lnav::document::discover_structure(
                                     content,
                                     line_range{0, -1},