[gthumb] added some comments to make the code clearer

[Paolo Bacchilega <paobac src gnome org>]

commit 2548663bab27ce2ed810e11588b8089ca37a8115
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Thu Mar 22 15:42:06 2012 +0100

    added some comments to make the code clearer

 gthumb/gth-browser.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/gthumb/gth-browser.c b/gthumb/gth-browser.c
index f80d9a1..aab3d35 100644
--- a/gthumb/gth-browser.c
+++ b/gthumb/gth-browser.c
@@ -5442,6 +5442,7 @@ file_metadata_ready_cb (GList    *files,
 		return;
 	}
 
+	/* the mime type can be different for example when a jpeg image has a .png extension */
 	different_mime_type = ! g_str_equal (gth_file_data_get_mime_type (browser->priv->current_file), gth_file_data_get_mime_type (file_data));
 
 	g_file_info_copy_into (file_data->info, browser->priv->current_file->info);
@@ -5475,6 +5476,8 @@ file_metadata_ready_cb (GList    *files,
 			gth_viewer_page_update_info (browser->priv->viewer_page, browser->priv->current_file);
 	}
 
+	/* location is NULL if the file has been loaded because requested
+	 * from the command line */
 	if (browser->priv->location == NULL) {
 		GFile *parent;