[LyX/master] Use QLocale::toDouble instead of QString::toDouble in the length validator

[Juergen Spitzmueller]

commit 187c5f0ef593dda3ffad93afcab0142b2909f988
Author: Juergen Spitzmueller <sp...@lyx.org>
Date:   Sun Mar 15 11:48:36 2015 +0100

    Use QLocale::toDouble instead of QString::toDouble in the length validator
    
    Fixes: #9214

diff --git a/src/frontends/qt4/Validator.cpp b/src/frontends/qt4/Validator.cpp
index 13f813e..4e363ac 100644
--- a/src/frontends/qt4/Validator.cpp
+++ b/src/frontends/qt4/Validator.cpp
@@ -40,8 +40,15 @@ LengthValidator::LengthValidator(QWidget * parent)
 
 QValidator::State LengthValidator::validate(QString & qtext, int &) const
 {
+       QLocale loc;
        bool ok;
-       qtext.trimmed().toDouble(&ok);
+       loc.toDouble(qtext.trimmed(), &ok);
+       if (!ok) {
+               // Fall back to C
+               QLocale c(QLocale::C);
+               c.toDouble(qtext.trimmed(), &ok);
+       }
+
        if (qtext.isEmpty() || ok)
                return QValidator::Acceptable;