Fix browsing the "resource" GVfs schema

It's a very mild improvement, but an improvement nonetheless.

fiv-browser.c

@@ -383,6 +383,10 @@ entry_add_thumbnail(gpointer data, gpointer user_data)
 			self->icon = g_object_ref(icon);
 		g_object_unref(info);
 	}
+
+	// The GVfs backend may not be friendly.
+	if (!self->icon)
+		self->icon = g_icon_new_for_string("text-x-generic-symbolic", NULL);
 out:
 	g_object_unref(file);
 }

fiv-sidebar.c

@@ -309,15 +309,27 @@ on_show_enter_location(
 	g_signal_connect(entry, "changed",
 		G_CALLBACK(on_enter_location_changed), self);
 
+	// Can't have it ellipsized and word-wrapped at the same time.
+	GtkWidget *protocols = gtk_label_new("");
+	gtk_label_set_ellipsize(GTK_LABEL(protocols), PANGO_ELLIPSIZE_END);
+	gtk_label_set_xalign(GTK_LABEL(protocols), 0);
+
+	gchar *protos = g_strjoinv(
+		", ", (gchar **) g_vfs_get_supported_uri_schemes(g_vfs_get_default()));
+	gchar *label = g_strdup_printf("<i>Available protocols:</i> %s", protos);
+	g_free(protos);
+	gtk_label_set_markup(GTK_LABEL(protocols), label);
+	g_free(label);
+
 	GtkWidget *content = gtk_dialog_get_content_area(GTK_DIALOG(dialog));
 	gtk_container_add(GTK_CONTAINER(content), entry);
+	gtk_container_add(GTK_CONTAINER(content), protocols);
 	gtk_dialog_set_default_response(GTK_DIALOG(dialog), GTK_RESPONSE_ACCEPT);
 	gtk_window_set_skip_taskbar_hint(GTK_WINDOW(dialog), TRUE);
 	gtk_window_set_default_size(GTK_WINDOW(dialog), 800, -1);
-
-	GdkGeometry geometry = {.max_width = G_MAXSHORT, .max_height = -1};
-	gtk_window_set_geometry_hints(
-		GTK_WINDOW(dialog), NULL, &geometry, GDK_HINT_MAX_SIZE);
+	gtk_window_set_geometry_hints(GTK_WINDOW(dialog), NULL,
+		&(GdkGeometry) {.max_width = G_MAXSHORT, .max_height = -1},
+		GDK_HINT_MAX_SIZE);
 	gtk_widget_show_all(dialog);
 
 	if (gtk_dialog_run(GTK_DIALOG(dialog)) == GTK_RESPONSE_ACCEPT) {
@@ -397,9 +409,16 @@ fiv_sidebar_new(FivIoModel *model)
 	g_return_val_if_fail(FIV_IS_IO_MODEL(model), NULL);
 
 	FivSidebar *self = g_object_new(FIV_TYPE_SIDEBAR, NULL);
-	self->model = g_object_ref(model);
+
+	// This doesn't work from the init function.
+	GtkWidget *sidebar_port = gtk_bin_get_child(GTK_BIN(self));
+	gtk_container_set_focus_hadjustment(GTK_CONTAINER(sidebar_port),
+		gtk_scrolled_window_get_hadjustment(GTK_SCROLLED_WINDOW(self)));
+	gtk_container_set_focus_vadjustment(GTK_CONTAINER(sidebar_port),
+		gtk_scrolled_window_get_vadjustment(GTK_SCROLLED_WINDOW(self)));
 
 	// TODO(p): There should be an extra signal to watch location changes only.
+	self->model = g_object_ref(model);
 	g_signal_connect_swapped(self->model, "subdirectories-changed",
 		G_CALLBACK(update_location), self);
 

fiv.c

@@ -566,11 +566,35 @@ on_item_activated(G_GNUC_UNUSED FivBrowser *browser, GFile *location,
 	g_free(uri);
 }
 
+static void open_any_file(GFile *file, gboolean force_browser);
+
+static void
+on_mounted_enclosing(GObject *source_object, GAsyncResult *res,
+	G_GNUC_UNUSED gpointer user_data)
+{
+	GFile *file = G_FILE(source_object);
+	GError *error = NULL;
+	if (!g_file_mount_enclosing_volume_finish(file, res, &error))
+		show_error_dialog(error);
+	else
+		open_any_file(file, FALSE);
+}
+
 static void
 open_any_file(GFile *file, gboolean force_browser)
 {
-	gchar *uri = g_file_get_uri(file);
 	GFileType type = g_file_query_file_type(file, G_FILE_QUERY_INFO_NONE, NULL);
+	if (type == G_FILE_TYPE_UNKNOWN &&
+		G_FILE_GET_IFACE(file)->mount_enclosing_volume) {
+		// TODO(p): At least provide some kind of indication.
+		GMountOperation *op = gtk_mount_operation_new(GTK_WINDOW(g.window));
+		g_file_mount_enclosing_volume(file, G_MOUNT_MOUNT_NONE, op, NULL,
+			on_mounted_enclosing, NULL);
+		g_object_unref(op);
+		return;
+	}
+
+	gchar *uri = g_file_get_uri(file);
 	if (type == G_FILE_TYPE_UNKNOWN) {
 		errno = ENOENT;
 		show_error_dialog(g_error_new(G_FILE_ERROR,
@@ -1124,6 +1148,52 @@ make_view_toolbar(void)
 	return view_toolbar;
 }
 
+static GtkWidget *
+make_browser_sidebar(FivIoModel *model)
+{
+	GtkWidget *sidebar = fiv_sidebar_new(model);
+	g_signal_connect(sidebar, "open-location",
+		G_CALLBACK(on_open_location), NULL);
+
+	g.plus = gtk_button_new_from_icon_name("zoom-in-symbolic",
+		GTK_ICON_SIZE_BUTTON);
+	gtk_widget_set_tooltip_text(g.plus, "Larger thumbnails");
+	g_signal_connect(g.plus, "clicked",
+		G_CALLBACK(on_toolbar_zoom), (gpointer) +1);
+
+	g.minus = gtk_button_new_from_icon_name("zoom-out-symbolic",
+		GTK_ICON_SIZE_BUTTON);
+	gtk_widget_set_tooltip_text(g.minus, "Smaller thumbnails");
+	g_signal_connect(g.minus, "clicked",
+		G_CALLBACK(on_toolbar_zoom), (gpointer) -1);
+
+	GtkWidget *zoom_group = gtk_box_new(GTK_ORIENTATION_HORIZONTAL, 0);
+	gtk_style_context_add_class(
+		gtk_widget_get_style_context(zoom_group), GTK_STYLE_CLASS_LINKED);
+	gtk_box_pack_start(GTK_BOX(zoom_group), g.plus, FALSE, FALSE, 0);
+	gtk_box_pack_start(GTK_BOX(zoom_group), g.minus, FALSE, FALSE, 0);
+
+	GtkWidget *funnel = gtk_toggle_button_new();
+	gtk_container_add(GTK_CONTAINER(funnel),
+		gtk_image_new_from_icon_name("funnel-symbolic", GTK_ICON_SIZE_BUTTON));
+	gtk_widget_set_tooltip_text(funnel, "Hide unsupported files");
+	g_signal_connect(funnel, "toggled",
+		G_CALLBACK(on_filtering_toggled), NULL);
+
+	GtkBox *toolbar = fiv_sidebar_get_toolbar(FIV_SIDEBAR(sidebar));
+	gtk_box_pack_start(toolbar, zoom_group, FALSE, FALSE, 0);
+	gtk_box_pack_start(toolbar, funnel, FALSE, FALSE, 0);
+	gtk_widget_set_halign(GTK_WIDGET(toolbar), GTK_ALIGN_CENTER);
+
+	g_signal_connect(g.browser, "notify::thumbnail-size",
+		G_CALLBACK(on_notify_thumbnail_size), NULL);
+	g_signal_connect(model, "notify::filtering",
+		G_CALLBACK(on_notify_filtering), funnel);
+	on_toolbar_zoom(NULL, (gpointer) 0);
+	gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(funnel), TRUE);
+	return sidebar;
+}
+
 // This is incredibly broken https://stackoverflow.com/a/51054396/76313
 // thus resolving the problem using overlaps.
 // We're trying to be universal for light and dark themes both. It's hard.
@@ -1271,48 +1341,7 @@ main(int argc, char *argv[])
 
 	// TODO(p): As with GtkFileChooserWidget, bind C-h to filtering,
 	// and mayhaps forward the rest to the sidebar, somehow.
-	g.browser_sidebar = fiv_sidebar_new(g.model);
-	g_signal_connect(g.browser_sidebar, "open-location",
-		G_CALLBACK(on_open_location), NULL);
-
-	// The opposite case, and it doesn't work from the init function.
-	GtkWidget *sidebar_port = gtk_bin_get_child(GTK_BIN(g.browser_sidebar));
-	gtk_container_set_focus_hadjustment(GTK_CONTAINER(sidebar_port),
-		gtk_scrolled_window_get_hadjustment(
-			GTK_SCROLLED_WINDOW(g.browser_sidebar)));
-	gtk_container_set_focus_vadjustment(GTK_CONTAINER(sidebar_port),
-		gtk_scrolled_window_get_vadjustment(
-			GTK_SCROLLED_WINDOW(g.browser_sidebar)));
-
-	g.plus = gtk_button_new_from_icon_name("zoom-in-symbolic",
-		GTK_ICON_SIZE_BUTTON);
-	gtk_widget_set_tooltip_text(g.plus, "Larger thumbnails");
-	g_signal_connect(g.plus, "clicked",
-		G_CALLBACK(on_toolbar_zoom), (gpointer) +1);
-
-	g.minus = gtk_button_new_from_icon_name("zoom-out-symbolic",
-		GTK_ICON_SIZE_BUTTON);
-	gtk_widget_set_tooltip_text(g.minus, "Smaller thumbnails");
-	g_signal_connect(g.minus, "clicked",
-		G_CALLBACK(on_toolbar_zoom), (gpointer) -1);
-
-	GtkWidget *zoom_group = gtk_box_new(GTK_ORIENTATION_HORIZONTAL, 0);
-	gtk_style_context_add_class(
-		gtk_widget_get_style_context(zoom_group), GTK_STYLE_CLASS_LINKED);
-	gtk_box_pack_start(GTK_BOX(zoom_group), g.plus, FALSE, FALSE, 0);
-	gtk_box_pack_start(GTK_BOX(zoom_group), g.minus, FALSE, FALSE, 0);
-
-	GtkWidget *funnel = gtk_toggle_button_new();
-	gtk_container_add(GTK_CONTAINER(funnel),
-		gtk_image_new_from_icon_name("funnel-symbolic", GTK_ICON_SIZE_BUTTON));
-	gtk_widget_set_tooltip_text(funnel, "Hide unsupported files");
-	g_signal_connect(funnel, "toggled",
-		G_CALLBACK(on_filtering_toggled), NULL);
-
-	GtkBox *toolbar = fiv_sidebar_get_toolbar(FIV_SIDEBAR(g.browser_sidebar));
-	gtk_box_pack_start(toolbar, zoom_group, FALSE, FALSE, 0);
-	gtk_box_pack_start(toolbar, funnel, FALSE, FALSE, 0);
-	gtk_widget_set_halign(GTK_WIDGET(toolbar), GTK_ALIGN_CENTER);
+	g.browser_sidebar = make_browser_sidebar(g.model);
 
 	g.browser_paned = gtk_paned_new(GTK_ORIENTATION_HORIZONTAL);
 	gtk_paned_add1(GTK_PANED(g.browser_paned), g.browser_sidebar);
@@ -1339,13 +1368,6 @@ main(int argc, char *argv[])
 		G_CALLBACK(on_window_state_event), NULL);
 	gtk_container_add(GTK_CONTAINER(g.window), g.stack);
 
-	g_signal_connect(g.browser, "notify::thumbnail-size",
-		G_CALLBACK(on_notify_thumbnail_size), NULL);
-	on_toolbar_zoom(NULL, (gpointer) 0);
-	g_signal_connect(g.model, "notify::filtering",
-		G_CALLBACK(on_notify_filtering), funnel);
-	gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(funnel), TRUE);
-
 	// Try to get half of the screen vertically, in 4:3 aspect ratio.
 	//
 	// We need the GdkMonitor before the GtkWindow has a GdkWindow (i.e.,