2 files changed, 30 insertions, 16 deletions

diff --git a/src/keyevents.c b/src/keyevents.c
index 18853ed..470d624 100644
--- a/src/keyevents.c
+++ b/src/keyevents.c
@@ -658,7 +658,10 @@ void feh_event_handle_keypress(XEvent * ev)
 		opt.hide_pointer = !opt.hide_pointer;
 	}
 	else if (feh_is_kp(&keys.jump_random, keysym, state)) {
-		slideshow_change_image(winwid, SLIDE_RAND, 1);
+		if (winwid->type == WIN_TYPE_THUMBNAIL)
+			feh_thumbnail_select_next(winwid, rand() % (filelist_len - 1));
+		else
+			slideshow_change_image(winwid, SLIDE_RAND, 1);
 	}
 	else if (feh_is_kp(&keys.toggle_caption, keysym, state)) {
 		if (opt.caption_path) {
diff --git a/src/thumbnail.c b/src/thumbnail.c
index da14760..a77152a 100644
--- a/src/thumbnail.c
+++ b/src/thumbnail.c
@@ -786,36 +786,47 @@ void feh_thumbnail_select(winwidget winwid, feh_thumbnail *thumbnail)
 
 void feh_thumbnail_select_next(winwidget winwid, int jump)
 {
-	gib_list *l, *tmp;
-	int i;
+	gib_list *l;
+	feh_thumbnail *thumb;
+	int len = 0, cur = 0, target = 0;
 
-	for (l = thumbnails; l && l->next; l = l->next) {
-		tmp = l;
-		for (i = jump; (i > 0) && tmp->next; i--)
-			tmp = tmp->next;
-		if (tmp->data == td.selected)
-			break;
+	for (l = thumbnails; l; l = l->next) {
+		thumb = FEH_THUMB(l->data);
+		if (thumb == td.selected)
+			cur = len;
+		len++;
 	}
 
-	feh_thumbnail_select(winwid, FEH_THUMB(l->data));
+	target = (cur + len - jump) % len;
+
+	for (l = thumbnails; l; l = l->next) {
+		if (target-- == 0) {
+			feh_thumbnail_select(winwid, FEH_THUMB(l->data));
+		}
+	}
 }
 
 void feh_thumbnail_select_prev(winwidget winwid, int jump)
 {
 	gib_list *l;
 	feh_thumbnail *thumb;
-	int i;
+	int len = 0, cur = 0, target = 0;
 
 	for (l = thumbnails; l; l = l->next) {
 		thumb = FEH_THUMB(l->data);
-		if ((thumb == td.selected) && l->next) {
-			for (i = jump; (i > 0) && l->next; i--)
-				l = l->next;
+		if (thumb == td.selected)
+			cur = len;
+		len++;
+	}
+
+	target = (cur + jump) % len;
+
+	for (l = thumbnails; l; l = l->next) {
+		if (target-- == 0) {
 			feh_thumbnail_select(winwid, FEH_THUMB(l->data));
-			return;
+			break;
 		}
 	}
-	feh_thumbnail_select(winwid, FEH_THUMB(thumbnails->data));
 }
 
 inline void feh_thumbnail_show_selected()