* Validator.{cpp, h}:

- add usignedGlueLengthValidator

* GuiVSpace.cpp:
	- re-allow the insertion of glue lengths (regression of the qt4 frontend)
	  (bug 6097)

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@30692 a592a061-630c-0410-9148-cb99ea01b6c8

src/frontends/qt4/GuiVSpace.cpp

@@ -59,7 +59,7 @@ GuiVSpace::GuiVSpace(GuiView & lv)
 	connect(unitCO, SIGNAL(selectionChanged(lyx::Length::UNIT)),
 		this, SLOT(change_adaptor()));
 
-	valueLE->setValidator(unsignedLengthValidator(valueLE));
+	valueLE->setValidator(unsignedGlueLengthValidator(valueLE));
 
 	// Manage the ok, apply, restore and cancel/close buttons
 	bc().setPolicy(ButtonPolicy::OkApplyCancelReadOnlyPolicy);

src/frontends/qt4/Validator.cpp

@@ -89,6 +89,14 @@ LengthValidator * unsignedLengthValidator(QLineEdit * ed)
 }
 
 
+LengthValidator * unsignedGlueLengthValidator(QLineEdit * ed)
+{
+	LengthValidator * v = new LengthValidator(ed);
+	v->setBottom(GlueLength());
+	return v;
+}
+
+
 LengthAutoValidator::LengthAutoValidator(QWidget * parent, QString const autotext)
 	: LengthValidator(parent),
 	  autotext_(autotext)

src/frontends/qt4/Validator.h

@@ -75,6 +75,13 @@ private:
 /// @returns a new @c LengthValidator that does not accept negative lengths.
 LengthValidator * unsignedLengthValidator(QLineEdit *);
 
+
+/** @returns a new @c LengthValidator that does not accept negative lengths.
+ *  but glue lengths.
+ */
+LengthValidator * unsignedGlueLengthValidator(QLineEdit *);
+
+
 /** A class to ascertain whether the data passed to the @c validate()
  *  member function can be interpretted as a GlueLength or is @param autotext.
  */