Set window title according to platform UI

The window title is built from the current file name and its
mofidication state. We use our own code instead of the automatic title
bar provided when windowFileName() is set because

1/ Qt does not keep the full path name
2/ Qt does not yield a nice application name

The "read only" and "version control" status are shown in the status bar:

* for read only we use the tab read only emblem (with the right size)
* for version control, we show the name of the backend (using a new
  vcname() method of the backend).

The iconText() of the view is not updated anymore, since this is
deprecated in Qt5.

src/LyXVC.cpp

@@ -41,6 +41,12 @@ LyXVC::LyXVC()
 }
 
 
+string LyXVC::vcname() const
+{
+	return vcs->vcname();
+}
+
+
 bool LyXVC::fileInVC(FileName const & fn)
 {
 	if (!RCS::findFile(fn).empty())

src/LyXVC.h

@@ -48,6 +48,8 @@ public:
 	};
 	///
 	LyXVC();
+	/// Name of the underlying VCS
+	std::string vcname() const;
 	/// Is \p fn under version control?
 	static bool fileInVC(support::FileName const & fn);
 	/** Not a good name perhaps. This function should be called whenever

src/VCBackend.h

@@ -38,6 +38,8 @@ public:
 	VCS(Buffer * b) : vcstatus(NOLOCKING), owner_(b) {}
 	virtual ~VCS() {}
 
+	/// the name of the vc backend
+	virtual std::string vcname() const = 0;
 	/// register a file for version control
 	virtual void registrer(std::string const & msg) = 0;
 	/// can this operation be processed in the current VCS?
@@ -150,6 +152,8 @@ public:
 	/// get file from repo, the caller must ensure that it does not exist locally
 	static bool retrieve(support::FileName const & file);
 
+	virtual std::string vcname() const { return "RCS"; };
+
 	virtual void registrer(std::string const & msg);
 
 	virtual bool renameEnabled();
@@ -234,6 +238,8 @@ public:
 	/// get file from repo, the caller must ensure that it does not exist locally
 	static bool retrieve(support::FileName const & file);
 
+	virtual std::string vcname() const { return "CVS"; };
+
 	virtual void registrer(std::string const & msg);
 
 	virtual bool renameEnabled();
@@ -373,6 +379,8 @@ public:
 	/// get file from repo, the caller must ensure that it does not exist locally
 	static bool retrieve(support::FileName const & file);
 
+	virtual std::string vcname() const { return "SVN"; };
+
 	virtual void registrer(std::string const & msg);
 
 	virtual bool renameEnabled();
@@ -481,6 +489,8 @@ public:
 	/// get file from repo, the caller must ensure that it does not exist locally
 	static bool retrieve(support::FileName const & file);
 
+	virtual std::string vcname() const { return "GIT"; };
+
 	virtual void registrer(std::string const & msg);
 
 	virtual bool renameEnabled();

src/frontends/qt4/GuiView.cpp

@@ -110,9 +110,7 @@
 #include <QSplitter>
 #include <QStackedWidget>
 #include <QStatusBar>
-#if QT_VERSION >= 0x050000
 #include <QSvgRenderer>
-#endif
 #include <QtConcurrentRun>
 #include <QTime>
 #include <QTimer>
@@ -553,7 +551,7 @@ GuiView::GuiView(int id)
 #endif
 
 #endif
-	resetWindowTitleAndIconText();
+	resetWindowTitle();
 
 	// use tabbed dock area for multiple docks
 	// (such as "source" and "messages")
@@ -577,6 +575,33 @@ GuiView::GuiView(int id)
 	connect(&d.processing_thread_watcher_, SIGNAL(finished()), 
 		busylabel, SLOT(hide()));
 
+	QFontMetrics const fm(statusBar()->fontMetrics());
+	int const roheight = max(int(d.normalIconSize), fm.height());
+	QSize const rosize(roheight, roheight);
+	QPixmap readonly = QPixmap(rosize);
+	QString imagedir = "images/";
+	FileName fname = imageLibFileSearch(imagedir, "emblem-readonly", "svgz");
+	QSvgRenderer renderer(toqstr(fname.absFileName()));
+	if (renderer.isValid()) {
+		readonly.fill(statusBar()->palette().color(QWidget::backgroundRole()));
+		QPainter painter(&readonly);
+		renderer.render(&painter);
+	} else {
+		readonly = getPixmap("images/", "emblem-readonly", "png").scaled(rosize, Qt::KeepAspectRatio);
+	}
+	read_only_ = new QLabel(statusBar());
+	read_only_->setPixmap(readonly);
+	read_only_->setScaledContents(true);
+	read_only_->setAlignment(Qt::AlignCenter);
+	read_only_->hide();
+	statusBar()->addPermanentWidget(read_only_);
+
+	version_control_ = new QLabel(statusBar());
+	version_control_->setAlignment(Qt::AlignCenter);
+	version_control_->setFrameStyle(QFrame::StyledPanel);
+	version_control_->hide();
+	statusBar()->addPermanentWidget(version_control_);
+
 	statusBar()->setSizeGripEnabled(true);
 	updateStatusBar();
 
@@ -1144,14 +1169,36 @@ void GuiView::updateWindowTitle(GuiWorkArea * wa)
 	if (wa != d.current_work_area_
 		|| wa->bufferView().buffer().isInternal())
 		return;
-	setWindowTitle(qt_("LyX: ") + wa->windowTitle());
-	setWindowIconText(wa->windowIconText());
-#if (QT_VERSION >= 0x040400)
+	Buffer const & buf = wa->bufferView().buffer();
 	// Sets the path for the window: this is used by OSX to
 	// allow a context click on the title bar showing a menu
 	// with the path up to the file
-	setWindowFilePath(toqstr(wa->bufferView().buffer().absFileName()));
+	setWindowFilePath(toqstr(buf.absFileName()));
+	// Tell Qt whether the current document is changed
+	setWindowModified(!buf.isClean());
+	// Set the windows title
+	docstring title = buf.fileName().displayName(130) + from_ascii("[*]");
+#ifndef Q_WS_MAC
+	// — U+2014 EM DASH
+	title += from_ascii(" ") + char_type(0x2014) + from_ascii(" LyX");
 #endif
+	setWindowTitle(toqstr(title));
+
+	if (buf.isReadonly())
+		read_only_->show();
+	else
+		read_only_->hide();
+
+	if (buf.lyxvc().inUse()) {
+		version_control_->show();
+		if (buf.lyxvc().locking())
+			version_control_->setText(
+				toqstr(bformat(_("%1$s lock"),
+				               from_ascii(buf.lyxvc().vcname()))));
+		else
+			version_control_->setText(toqstr(buf.lyxvc().vcname()));
+	} else
+		version_control_->hide();
 }
 
 
@@ -1196,7 +1243,7 @@ void GuiView::on_lastWorkAreaRemoved()
 	updateDialog("document", "");
 	updateDialogs();
 
-	resetWindowTitleAndIconText();
+	resetWindowTitle();
 	updateStatusBar();
 
 	if (lyxrc.open_buffers_in_tabs)
@@ -1285,7 +1332,7 @@ bool GuiView::event(QEvent * e)
 			updateDialog("document", "");
 			updateDialogs();
 		} else {
-			resetWindowTitleAndIconText();
+			resetWindowTitle();
 		}
 		setFocus();
 		return QMainWindow::event(e);
@@ -1312,10 +1359,9 @@ bool GuiView::event(QEvent * e)
 	}
 }
 
-void GuiView::resetWindowTitleAndIconText()
+void GuiView::resetWindowTitle()
 {
 	setWindowTitle(qt_("LyX"));
-	setWindowIconText(qt_("LyX"));
 }
 
 bool GuiView::focusNextPrevChild(bool /*next*/)

src/frontends/qt4/GuiView.h

@@ -24,6 +24,7 @@
 class QCloseEvent;
 class QDragEnterEvent;
 class QDropEvent;
+class QLabel;
 class QMenu;
 class QShowEvent;
 
@@ -220,12 +221,12 @@ public Q_SLOTS:
 	/// idle timeout.
 	/// clear any temporary message and replace with current status.
 	void clearMessage();
+	///
+	void updateWindowTitle(GuiWorkArea * wa);
 
 private Q_SLOTS:
 	///
-	void updateWindowTitle(GuiWorkArea * wa);
-	///
-	void resetWindowTitleAndIconText();
+	void resetWindowTitle();
 
 	///
 	void on_currentWorkAreaChanged(GuiWorkArea *);
@@ -455,6 +456,11 @@ private:
 	/// Request to give focus to minibuffer
 	bool minibuffer_focus_;
 
+	/// Statusbar widget that shows read-only status
+	QLabel * read_only_;
+	/// Statusbar widget that shows version control status
+	QLabel * version_control_;
+
 };
 
 } // namespace frontend

src/frontends/qt4/GuiWorkArea.cpp

@@ -1387,35 +1387,9 @@ QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
 
 void GuiWorkArea::updateWindowTitle()
 {
-	docstring maximize_title;
-	docstring minimize_title;
-
-	Buffer const & buf = d->buffer_view_->buffer();
-	FileName const file_name = buf.fileName();
-	if (!file_name.empty()) {
-		maximize_title = file_name.displayName(130);
-		minimize_title = from_utf8(file_name.onlyFileName());
-		if (buf.lyxvc().inUse()) {
-			if (buf.lyxvc().locking())
-				maximize_title +=  _(" (version control, locking)");
-			else
-				maximize_title +=  _(" (version control)");
-		}
-		if (!buf.isClean()) {
-			maximize_title += _(" (changed)");
-			minimize_title += char_type('*');
-		}
-		if (buf.isReadonly())
-			maximize_title += _(" (read only)");
-	}
-
-	QString const new_title = toqstr(maximize_title);
-	if (new_title != windowTitle()) {
-		QWidget::setWindowTitle(new_title);
-		QWidget::setWindowIconText(toqstr(minimize_title));
+	d->lyx_view_->updateWindowTitle(this);
 	titleChanged(this);
 }
-}
 
 
 bool GuiWorkArea::isFullScreen() const