Add support for contents() to designer documents

Change-Id: Ie8c65c7a692d752bac3b6427f66116282b486576
Reviewed-by: Eike Ziller <eike.ziller@theqtcompany.com>

src/plugins/designer/formwindowfile.cpp

@@ -141,6 +141,11 @@ bool FormWindowFile::save(QString *errorString, const QString &name, bool autoSa
     return true;
 }
 
+QByteArray FormWindowFile::contents() const
+{
+    return formWindowContents().toUtf8();
+}
+
 bool FormWindowFile::setContents(const QByteArray &contents)
 {
     if (Designer::Constants::Internal::debug)
@@ -184,6 +189,8 @@ void FormWindowFile::setFilePath(const FileName &newName)
 void FormWindowFile::updateIsModified()
 {
     bool value = m_formWindow && m_formWindow->isDirty();
+    if (value)
+        emit contentsChanged();
     if (value == m_isModified)
         return;
     m_isModified = value;

src/plugins/designer/formwindowfile.h

@@ -56,6 +56,7 @@ public:
     OpenResult open(QString *errorString, const QString &fileName,
                     const QString &realFileName) override;
     bool save(QString *errorString, const QString &fileName, bool autoSave) override;
+    QByteArray contents() const override;
     bool setContents(const QByteArray &contents) override;
     bool shouldAutoSave() const override;
     bool isModified() const override;