From 760b7d8ec25272eb1c347e5b13d0c6f2bd04e421 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20T=C5=AFma?= <tumic@cbox.cz>
Date: Sun, 6 Jan 2019 21:15:49 +0100
Subject: [PATCH] Do not try to repeatedly open a missing DEM file

---
 src/data/dem.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/data/dem.cpp b/src/data/dem.cpp
index 722042ba..218d93a0 100644
--- a/src/data/dem.cpp
+++ b/src/data/dem.cpp
@@ -66,9 +66,10 @@ qreal DEM::elevation(const Coordinates &c)
 	QMap<Key, QByteArray>::const_iterator it(_data.find(k));
 	if (it == _data.constEnd()) {
 		QFile file(fileName(k));
-		if (!file.open(QIODevice::ReadOnly))
+		if (!file.open(QIODevice::ReadOnly)) {
+			_data.insert(k, QByteArray());
 			return NAN;
-		else {
+		} else {
 			it = _data.insert(k, file.readAll());
 			return height(c, *it);
 		}