Make sure GPS Exif tags are named and ordered correctly

Some GPS tag IDs overlap with IDs from other IFDs.
Specifically check for the GPS IFD and order the entries accordingly.
Also respect the IFD when determining the tag's title.

https://bugzilla.gnome.org/show_bug.cgi?id=627185

origin commit:
https://gitlab.gnome.org/GNOME/eog/commit/8574b4b

Fixes #125

src/eom-exif-details.c

@@ -283,6 +283,11 @@ get_exif_category (ExifEntry *entry)
 	ExifCategory cat = EXIF_CATEGORY_OTHER;
 	int i;
 
+	/* Some GPS tag IDs overlap with other ones, so check the IFD */
+	if (exif_entry_get_ifd (entry) == EXIF_IFD_GPS) {
+		return EXIF_CATEGORY_OTHER;
+	}
+
 	for (i = 0; exif_tag_category_map [i].id != -1; i++) {
 		if (exif_tag_category_map[i].id == (int) entry->tag) {
 			cat = exif_tag_category_map[i].category;
@@ -353,6 +358,7 @@ exif_entry_cb (ExifEntry *entry, gpointer data)
 	EomExifDetails *view;
 	EomExifDetailsPrivate *priv;
 	ExifCategory cat;
+	ExifIfd ifd = exif_entry_get_ifd (entry);
 	char *path;
 	char b[1024];
 
@@ -367,7 +373,7 @@ exif_entry_cb (ExifEntry *entry, gpointer data)
 		set_row_data (store,
 			      path,
 			      NULL,
-			      exif_tag_get_name (entry->tag),
+			      exif_tag_get_name_in_ifd (entry->tag, ifd),
 			      exif_entry_get_value (entry, b, sizeof(b)));
 	} else {
 
@@ -399,7 +405,7 @@ exif_entry_cb (ExifEntry *entry, gpointer data)
 			path = set_row_data (store,
 					     NULL,
 					     exif_categories[cat].path,
-					     exif_tag_get_name (entry->tag),
+					     exif_tag_get_name_in_ifd (entry->tag, ifd),
 					     exif_entry_get_value (entry, b,
 								   sizeof(b)));