X-Git-Url: http://winboard.nl/cgi-bin?a=blobdiff_plain;f=filebrowser%2Fdraw.c;h=abab957979d3c642164ace9e0ef43a5bd4557dc8;hb=e9a0808a5551217eb4fd29d949f3c7672545c168;hp=46ed663118336f907a69e1d03c8ad6b01c4c11fd;hpb=5dca19a2828b0e6e0594b734792533e0c4f76146;p=xboard.git

diff --git a/filebrowser/draw.c b/filebrowser/draw.c
index 46ed663..abab957 100644
--- a/filebrowser/draw.c
+++ b/filebrowser/draw.c
@@ -655,7 +655,10 @@ SFvSliderMovedCallback(w, n, new)
 
 	dir = &(SFdirs[SFdirPtr + n]);
 
+
 	old = dir->vOrigin;
+	if(new == -1) new = old + 1; else if(new == -2) new = old - 1; // [HGM] indicates scroll direction on mousewheel event
+	if(new < 0 || new > dir->nEntries - SFlistSize) return;
 	dir->vOrigin = new;
 
 	if (old == new) {