Fix bugtracker #95: collections pane shows "Untitled project" for a titleless project

The root of a project's embedded collection showed "Projet sans titre"
whenever the project had no title, while the project panel shows the
file name. Fall back to the file name the same way, and only use
"Projet sans titre" for a project that has neither.

The name was also computed once, so changing the project title or saving
it under a new name left the pane stale until the collections were
reloaded. Update it on projectTitleChanged and projectFilePathChanged.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

sources/ElementsCollection/elementscollectionmodel.cpp

@@ -503,6 +503,10 @@ void ElementsCollectionModel::addProject(QETProject *project, bool set_data)
 	connect(project->embeddedElementCollection(),
 		&XmlElementCollection::directoryRemoved,
 		this, &ElementsCollectionModel::itemRemovedFromCollection);
+	connect(project, &QETProject::projectTitleChanged,
+		this, &ElementsCollectionModel::projectNameChanged);
+	connect(project, &QETProject::projectFilePathChanged,
+		this, &ElementsCollectionModel::projectNameChanged);
 }
 
 /**
@@ -534,6 +538,10 @@ void ElementsCollectionModel::removeProject(QETProject *project)
 			   &XmlElementCollection::directoryRemoved,
 			   this,
 			   &ElementsCollectionModel::itemRemovedFromCollection);
+		disconnect(project, &QETProject::projectTitleChanged,
+			   this, &ElementsCollectionModel::projectNameChanged);
+		disconnect(project, &QETProject::projectFilePathChanged,
+			   this, &ElementsCollectionModel::projectNameChanged);
 	}
 }
 
@@ -774,3 +782,15 @@ void ElementsCollectionModel::updateItem(const QString& path)
 		eci->setUpData();
 	}
 }
+
+/**
+	@brief ElementsCollectionModel::projectNameChanged
+	Update the displayed name of the collection of project,
+	when its title or its file path changed.
+	@param project
+*/
+void ElementsCollectionModel::projectNameChanged(QETProject *project)
+{
+	if (XmlProjectElementCollectionItem *xpeci = m_project_hash.value(project))
+		xpeci->updateProjectName();
+}

sources/ElementsCollection/elementscollectionmodel.h

@@ -73,6 +73,7 @@ class ElementsCollectionModel : public QStandardItemModel
 		void elementIntegratedToCollection (const QString& path);
 		void itemRemovedFromCollection (const QString& path);
 		void updateItem (const QString& path);
+		void projectNameChanged (QETProject *project);
 
 	private:
 		QList <QETProject *> m_project_list;

sources/ElementsCollection/xmlprojectelementcollectionitem.cpp

@@ -21,6 +21,8 @@
 #include "../qetproject.h"
 #include "xmlelementcollection.h"
 
+#include <QFileInfo>
+
 /**
 	@brief XmlProjectElementCollectionItem::XmlProjectElementCollectionItem
 	Constructor
@@ -58,10 +60,7 @@ QString XmlProjectElementCollectionItem::localName()
 		return text();
 
 	if (isCollectionRoot()) {
-		if (m_project->title().isEmpty())
-			setText(QObject::tr("Projet sans titre"));
-		else
-			setText(m_project->title());
+		updateProjectName();
 	}
 	else {
 		ElementsLocation location (embeddedPath(), m_project);
@@ -71,6 +70,25 @@ QString XmlProjectElementCollectionItem::localName()
 	return text();
 }
 
+/**
+	@brief XmlProjectElementCollectionItem::updateProjectName
+	Set the displayed name of the collection root from the project :
+	its title, or its file name when it has no title, like the project panel.
+	Does nothing if this item is not the root of the collection.
+*/
+void XmlProjectElementCollectionItem::updateProjectName()
+{
+	if (!isCollectionRoot() || !m_project)
+		return;
+
+	if (!m_project->title().isEmpty())
+		setText(m_project->title());
+	else if (!m_project->filePath().isEmpty())
+		setText(QFileInfo(m_project->filePath()).completeBaseName());
+	else
+		setText(QObject::tr("Projet sans titre"));
+}
+
 /**
 	@brief XmlProjectElementCollectionItem::name
 	@return The collection name of this item

sources/ElementsCollection/xmlprojectelementcollectionitem.h

@@ -45,6 +45,7 @@ class XmlProjectElementCollectionItem : public ElementCollectionItem
 		bool isCollectionRoot() const override;
 		void addChildAtPath(const QString &collection_name) override;
 		QETProject * project() const;
+		void updateProjectName();
 
 		void setProject (QETProject *project,
 				 bool set_data = true,