Visualization bug fixes.

lib/galaxy/webapps/galaxy/api/datasets.py

@@ -194,7 +194,7 @@ class DatasetsController( BaseAPIController, UsesVisualizationMixin, UsesHistory
             max_vals = data_provider.get_default_max_vals()
 
         # Get reference sequence and mean depth for region; these is used by providers for aligned reads.
-        ref_seq = None
+        region = None
         mean_depth = None
         if isinstance( data_provider, (SamDataProvider, BamDataProvider ) ):
             # Get reference sequence.

static/scripts/viz/trackster/painters.js

@@ -1462,6 +1462,7 @@ extend(VariantPainter.prototype, Painter.prototype, {
         if (num_samples === 1) {
             row_height = feature_height = 
                 (w_scale < ctx.canvas.manager.char_width_px ? this.prefs.summary_height : row_height);
+            paint_utils.row_height = row_height;
             // No summary when there's a single sample.
             draw_summary = false;
         }