Issue #170: crash while creating a line. (dismine/valentina)

New issue 170: crash while creating a line. https://bitbucket.org/valentinateam/valentina/issue/170/crash-while-creating-a-line

cosina:

I wanted to create a line. After selecting the point. QT is getting masses of this errors - I guess in the end valentina is killed because of that.

Math parser error: Message: “Variable buffer overflow.” Expression: "16.5983 " -------------------------------------- (…....\valentina\src\app\dialogs\tools\dialogtool.cpp:472, void DialogTool::Eval(const QString&, bool&, QTimer*, QLabel*, const QString&, bool))

Math parser error: Message: "Unexpected token “.5337 " found at position 2.” Expression: "26.5337 " -------------------------------------- (…....\valentina\src\app\dialogs\tools\dialogtool.cpp:472, void DialogTool::Eval(const QString&, bool&, QTimer*, QLabel*, const QString&, bool))