New Project Wizard: Recheck existence of directory after browsing

The user might create directories or delete them while in the browsing
interface, thus in the PathChooser trigger a validation after browsing.

Task-Nr: QTCREATORBUG-3105
Reviewed-By: Friedemann Kleint

src/libs/utils/pathchooser.cpp

@@ -270,6 +270,7 @@ void PathChooser::slotBrowse()
     }
 
     emit browsingFinished();
+    m_d->m_lineEdit->triggerChanged();
 }
 
 bool PathChooser::isValid() const

src/libs/utils/projectintropage.cpp

@@ -66,6 +66,7 @@ ProjectIntroPage::ProjectIntroPage(QWidget *parent) :
     m_d->m_ui.nameLineEdit->setFocus();
     connect(m_d->m_ui.pathChooser, SIGNAL(changed(QString)), this, SLOT(slotChanged()));
     connect(m_d->m_ui.nameLineEdit, SIGNAL(textChanged(QString)), this, SLOT(slotChanged()));
+    connect(m_d->m_ui.pathChooser, SIGNAL(validChanged()), this, SLOT(slotChanged()));
     connect(m_d->m_ui.pathChooser, SIGNAL(returnPressed()), this, SLOT(slotActivated()));
     connect(m_d->m_ui.nameLineEdit, SIGNAL(validReturnPressed()), this, SLOT(slotActivated()));
 }