Fix parent-child relationships for some Qt objects

[elfring]

👀 Some Qt objects are created without specifying a corresponding pointer for the parameter “parent”.

Examples:

• BackUp constructor
  

  DataTex/datatex/backup.cpp

  Lines 63 to 65 in 99fda6b

  	for (int i=0;i<DataTex::GlobalFilesDatabaseList.count();i++ ) {
  	QTreeWidgetItem * item = new QTreeWidgetItem();
  	item->setText(3,QFileInfo(DataTex::GlobalFilesDatabaseList.values().at(i).databaseName()).baseName());

• DataTables::LoadFields
  

  DataTex/datatex/datatables.cpp

  Lines 278 to 283 in a6eff08

  	fields.exec(SqlFunctions::Fields_Query);
  	while(fields.next()){
  	item++;
  	ui->FieldTable->insertRow(item);
  	ui->FieldTable->setItem(item,0 , new QTableWidgetItem(fields.value(0).toString()));
  	ui->FieldTable->setItem(item,1 , new QTableWidgetItem(fields.value(1).toString()));

• InfoPage constructor
  

  DataTex/datatex/basefolder.cpp

  Lines 75 to 93 in a6eff08

  	InfoPage::InfoPage(QWidget *parent)
  	: QWizardPage(parent)
  	{
  	QSqlQuery DatabaseListQuery(DataTex::DataTeX_Settings);
  	DatabaseListQuery.exec("SELECT FileName FROM Databases");
  	while (DatabaseListQuery.next()) {
  	DatabaseList.append(DatabaseListQuery.value(0).toString());
  	}
  	setTitle("Create new Database");
  	setPixmap(QWizard::WatermarkPixmap, QPixmap(":/images/datatex.png"));
  	QLabel *label = new QLabel(tr("This wizard will help you create a new LaTeX database for DataTex."));
  	label->setWordWrap(true);
  	QVBoxLayout *layout = new QVBoxLayout;
  	QHBoxLayout *hlayout = new QHBoxLayout;
  	QHBoxLayout *hlayout2 = new QHBoxLayout;
  	QHBoxLayout *hlayout3 = new QHBoxLayout;
  	BaseFolder::FilesDB = new QRadioButton(tr("Files Database"));
  	BaseFolder::DocsDB = new QRadioButton(tr("Document Database"));
  	QHBoxLayout * RadioLH = new QHBoxLayout;

• LatexTextBrowser constructor
  

  DataTex/datatex/highlighter.cpp

  Lines 148 to 152 in 99fda6b

  	LatexTextBrowser::LatexTextBrowser(QWidget *parent) :
  	QTextEdit(parent)
  	{
  	Highlighter * h = new Highlighter();
  	h->setDocument(LatexTextBrowser::document());

💭 I got the impression that such data would be required for safe management of parent-child relationships at more source code places.

[CSMathematics]

Indeed, there are many parts of code that need to be carefully considered.Τhanks for the remark .