From d6381bc36c0d470b5684c0169d23a1832cd44535 Mon Sep 17 00:00:00 2001
From: Nyall Dawson <nyall.dawson@gmail.com>
Date: Thu, 30 Apr 2020 11:28:37 +1000
Subject: [PATCH] [pal] Avoid overly eager truncation of polygon candidates for
 long skinny polygons

---
 src/core/pal/pal.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/core/pal/pal.cpp b/src/core/pal/pal.cpp
index e9899d368719..ec3b12c0ffed 100644
--- a/src/core/pal/pal.cpp
+++ b/src/core/pal/pal.cpp
@@ -312,7 +312,7 @@ std::unique_ptr<Problem> Pal::extract( const QgsRectangle &extent, const QgsGeom
           break;
 
         case GEOS_POLYGON:
-          maxCandidates = feat->feature->maximumPolygonCandidates();
+          maxCandidates = std::max( static_cast< std::size_t >( 4 ), feat->feature->maximumPolygonCandidates() );
           break;
       }