0 is a plausible intermediate length in positive context (#12508)

diff --git a/src/frontends/qt/Validator.cpp b/src/frontends/qt/Validator.cpp
index 0d3b672f1228d5d5c08ea5b43ac9ff6ef812487b..1ef90ac2c86f86156c4d3eb7a9cb714378601b03 100644 (file)
--- a/src/frontends/qt/Validator.cpp
+++ b/src/frontends/qt/Validator.cpp
@@ -56,6 +56,10 @@ QValidator::State LengthValidator::validate(QString & qtext, int &) const
        if (ok && unsigned_ && d < 0)
                return QValidator::Invalid;
 
+       if (ok && positive_ && d == 0)
+               // A plausible intermediate value, see #12508
+               return QValidator::Intermediate;
+
        if (ok && positive_ && d <=0)
                return QValidator::Invalid;