Factor out (signed) glueLenghValidator

src/frontends/qt/GuiDocument.cpp

@@ -894,9 +894,7 @@ GuiDocument::GuiDocument(GuiView & lv)
 	textLayoutModule->indentLE->setValidator(new LengthValidator(
 		textLayoutModule->indentLE, false));
 	// parskip accepts glue length
-	LengthValidator * skipLEValidator = new LengthValidator(textLayoutModule->skipLE, false);
-	skipLEValidator->setBottom(GlueLength());
-	textLayoutModule->skipLE->setValidator(skipLEValidator);
+	textLayoutModule->skipLE->setValidator(glueLengthValidator(textLayoutModule->skipLE));
 
 	textLayoutModule->indentCO->addItem(qt_("Default"), toqstr("default"));
 	textLayoutModule->indentCO->addItem(qt_("Custom"), toqstr("custom"));

src/frontends/qt/GuiLine.cpp

@@ -56,7 +56,7 @@ GuiLine::GuiLine(QWidget * parent) : InsetParamsWidget(parent)
 	addCheckedWidget(WidthLE, WidthValueL);
 	addCheckedWidget(HeightLE, HeightValueL);
 
-	OffsetLE->setValidator(unsignedGlueLengthValidator(OffsetLE));
+	OffsetLE->setValidator(glueLengthValidator(OffsetLE));
 	WidthLE->setValidator(unsignedGlueLengthValidator(WidthLE));
 	HeightLE->setValidator(unsignedGlueLengthValidator(HeightLE));
 

src/frontends/qt/GuiVSpace.cpp

@@ -53,10 +53,7 @@ GuiVSpace::GuiVSpace(QWidget * parent) : InsetParamsWidget(parent)
 	connect(spacingCO, SIGNAL(activated(int)),
 		this, SLOT(enableCustom(int)));
 
-	// Set up a signed glue length validator
-	LengthValidator * v = new LengthValidator(valueLE);
-	v->setBottom(GlueLength());
-	valueLE->setValidator(v);
+	valueLE->setValidator(glueLengthValidator(valueLE));
 
 	// initialize the length validator
 	addCheckedWidget(valueLE, valueL);

src/frontends/qt/Validator.cpp

@@ -134,6 +134,15 @@ LengthValidator * unsignedGlueLengthValidator(QLineEdit * ed)
 }
 
 
+LengthValidator * glueLengthValidator(QLineEdit * ed)
+{
+	LengthValidator * v = new LengthValidator(ed);
+	v->setBottom(GlueLength());
+	v->setUnsigned(false);
+	return v;
+}
+
+
 LengthAutoValidator::LengthAutoValidator(QWidget * parent, QString const & autotext)
 	: LengthValidator(parent),
 	  autotext_(autotext)

src/frontends/qt/Validator.h

@@ -86,6 +86,11 @@ LengthValidator * unsignedLengthValidator(QLineEdit *);
  */
 LengthValidator * unsignedGlueLengthValidator(QLineEdit *);
 
+/** @returns a new @c LengthValidator that does accept negative lengths
+ *  and glue lengths.
+ */
+LengthValidator * glueLengthValidator(QLineEdit *);
+
 
 /** A class to ascertain whether the data passed to the @c validate()
  *  member function can be interpreted as a GlueLength or is @param autotext.