From 33064ec057eedd05aaba90276a14143a976b5be0 Mon Sep 17 00:00:00 2001
From: Nils <>
Date: Wed, 6 Jan 2021 18:58:44 +0100
Subject: [PATCH] shadow support for differently sized patterns

---
 qtgui/pattern_grid.py | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/qtgui/pattern_grid.py b/qtgui/pattern_grid.py
index e88fe5b..63d4272 100644
--- a/qtgui/pattern_grid.py
+++ b/qtgui/pattern_grid.py
@@ -425,10 +425,17 @@ class PatternGrid(QtWidgets.QGraphicsScene):
     def createShadow(self, exportDict):
         """Receives steps from another track and display them as shadoy steps in the current one
         as a reference. Creating a new shadow does not delete the old one.
+
+        It is possible that the source pattern is longer (multiplicator) than our own. We ignore
+        all shadows beyond our own length.
+
+        Same is true if the source has more notes (pitches) than ours. We do naive x/y mapping.
+        Making sense of that is up to the user :)
         """
         for x, y in ((s["index"], s["pitch"]) for s in exportDict["pattern"]):
-            self._steps[(x,y)].shadow = True   # (x,y):Step()
-            self._steps[(x,y)].setApperance()
+            if (x,y) in self._steps:
+                self._steps[(x,y)].shadow = True   # (x,y):Step()
+                self._steps[(x,y)].setApperance()
 
     def removeShadows(self):
         for step in self._steps.values():