Minor improvements

glade/mainWindow.glade

@@ -494,6 +494,7 @@
   </object>
   <object class="GtkWindow" id="settingsDialog">
     <property name="can_focus">False</property>
+    <property name="window_position">center</property>
     <property name="destroy_with_parent">True</property>
     <child>
       <object class="GtkBox">
@@ -543,7 +544,17 @@
       </object>
     </child>
     <child type="titlebar">
+      <object class="GtkHeaderBar">
+        <property name="visible">True</property>
+        <property name="can_focus">False</property>
+        <property name="title">Preferences</property>
+        <property name="has_subtitle">False</property>
+        <property name="show_close_button">True</property>
+        <property name="decoration_layout">close:</property>
+        <child>
           <placeholder/>
         </child>
       </object>
+    </child>
+  </object>
 </interface>

src/mainwindow.c

@@ -432,10 +432,12 @@ static void mainWindow_init_to_default(struct mainWindow *mainWindow)
  */
 void mainWindow_renderer_set(struct mainWindow *mainWindow, enum renderer_mode state)
 {
+	if (mainWindow->renderer == state)
+		return;
+
 	if (state == RENDERER_HTML) {
 		if (!mainWindow->webkitView) {
 			mainWindow->webkitView = webkit_web_view_new();
-			webkit_web_view_load_html_string(WEBKIT_WEB_VIEW(mainWindow->webkitView), "", "");
 			gtk_widget_show(mainWindow->webkitView);
 
 			mainWindow->webkitScrollArea = gtk_scrolled_window_new(NULL, NULL);
@@ -464,7 +466,6 @@ static void mainWindow_settings_combo_changed(GtkComboBox *widget, gpointer user
 	else if (!strcmp(gtk_combo_box_get_active_id(GTK_COMBO_BOX(mainWindow->settingsDialog.comboDisplayMode)), "html"))
 		mainWindow_renderer_set(mainWindow, RENDERER_HTML);
 
-
 	mainWindow_entrySelected(NULL, user_data);
 }
 
@@ -564,6 +565,8 @@ struct mainWindow *mainWindow_new()
 	mainWindow->time_earliest = 0;
 	mainWindow->time_latest   = 0;
 
+	mainWindow->renderer = RENDERER_NONE;
+
 	gtk_builder_connect_signals(builder, NULL);
 
 	g_object_unref(G_OBJECT(builder));

src/mainwindow.h

@@ -16,6 +16,7 @@ enum {
 };
 
 enum renderer_mode {
+	RENDERER_NONE = -1,
 	RENDERER_TEXT = 0,
 	RENDERER_BASIC,
 	RENDERER_HTML