Do not display the backdrop in text viewer and editor plugins

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@14835 a1c6a512-1295-4272-9138-f99709370657

apps/plugins/text_editor.c

@@ -322,6 +322,10 @@ enum plugin_status plugin_start(struct plugin_api* api, void* parameter)
     prev_show_statusbar = rb->global_settings->statusbar;
     rb->global_settings->statusbar = false;
 
+#if LCD_DEPTH > 1
+    rb->lcd_set_backdrop(NULL);
+#endif
+
 #ifdef HAVE_ADJUSTABLE_CPU_FREQ
     rb->cpu_boost(1);
 #endif

apps/plugins/viewer.c

@@ -1375,6 +1375,10 @@ enum plugin_status plugin_start(struct plugin_api* api, void* file)
     viewer_reset_settings(); /* load defaults first */
     viewer_load_settings(); /* .. then try to load from disk */
     
+#if LCD_DEPTH > 1
+    rb->lcd_set_backdrop(NULL);
+#endif
+    
     viewer_draw(col);
 
     while (!done) {