From 4b92a6c72203466e2912fe4dff2a79dbd16e1418 Mon Sep 17 00:00:00 2001
From: "Sascha L. Teichmann" <sascha.teichmann@intevation.de>
Date: Sun, 26 Feb 2017 13:21:39 +0100
Subject: [PATCH] Do not leave the current area when re-checking the coverage
 area.

---
 common/area.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/common/area.go b/common/area.go
index 2d80d35..c26fb1d 100644
--- a/common/area.go
+++ b/common/area.go
@@ -62,7 +62,7 @@ func UncoveredAreas(r *Renderer, newAreas, oldAreas []Area) []Area {
 							// Extension in x possible?
 							if extendDirs&1 == 1 {
 								nx := area.X2 + 1
-								if nx >= int16(r.width) {
+								if nx > oldArea.X2 {
 									extendDirs &= ^1
 									continue
 								}
@@ -79,7 +79,7 @@ func UncoveredAreas(r *Renderer, newAreas, oldAreas []Area) []Area {
 						} else if extendDirs&2 == 2 {
 							// Symmetric case in z direction
 							nz := area.Z2 + 1
-							if nz >= int16(r.height) {
+							if nz > oldArea.Z2 {
 								extendDirs &= ^2
 								continue
 							}