Restrict file cache expiry time to positive values.

diff --git a/src/frontends/qt4/GuiPrefs.cpp b/src/frontends/qt4/GuiPrefs.cpp
index 1d8bb201ff0dfc813a9e14d5d83acf749e115023..69877e38daff72356fe0fbddd29e4431baca1133 100644 (file)
--- a/src/frontends/qt4/GuiPrefs.cpp
+++ b/src/frontends/qt4/GuiPrefs.cpp
@@ -72,6 +72,7 @@
 #include <iomanip>
 #include <sstream>
 #include <algorithm>
+#include <math.h>
 
 using namespace Ui;
 
@@ -1683,7 +1684,7 @@ PrefConverters::PrefConverters(GuiPreferences * form)
 
        converterED->setValidator(new NoNewLineValidator(converterED));
        converterFlagED->setValidator(new NoNewLineValidator(converterFlagED));
-       maxAgeLE->setValidator(new QDoubleValidator(maxAgeLE));
+       maxAgeLE->setValidator(new QDoubleValidator(0, HUGE_VAL, 6, maxAgeLE));
        //converterDefGB->setFocusProxy(convertersLW);
 }