From ed1bf182a025051c1a9fcf3b5b6c38ff436be39e Mon Sep 17 00:00:00 2001
From: Jean-Yves Tinevez <tinevez@pasteur.fr>
Date: Wed, 24 May 2023 13:35:44 +0200
Subject: [PATCH] Fix OverlapTracker not working if the first frame was devoid
 of visible spots.
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Noticed by Laura Xénard  @Mini-Miette
Fix #260
---
 .../plugin/trackmate/tracking/overlap/OverlapTracker.java     | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/main/java/fiji/plugin/trackmate/tracking/overlap/OverlapTracker.java b/src/main/java/fiji/plugin/trackmate/tracking/overlap/OverlapTracker.java
index 2741fa2ad..09ad4005f 100644
--- a/src/main/java/fiji/plugin/trackmate/tracking/overlap/OverlapTracker.java
+++ b/src/main/java/fiji/plugin/trackmate/tracking/overlap/OverlapTracker.java
@@ -203,7 +203,11 @@ public boolean process()
 			final Map< Spot, Polygon2D > targetGeometries = createGeometry( spots.iterable( targetFrame, true ), method, enlargeFactor );
 
 			if ( sourceGeometries.isEmpty() || targetGeometries.isEmpty() )
+			{
+				sourceGeometries = targetGeometries;
+				logger.setProgress( ( double ) progress++ / spots.keySet().size() );
 				continue;
+			}
 
 			final ExecutorService executors = Executors.newFixedThreadPool( numThreads );
 			final List< Future< IoULink > > futures = new ArrayList<>();