LtsWidgets: Qt6 API fixes complete

- QComboBox::activated signal: QString→int parameter (lts_text_editor)
- qAsConst→std::as_const (5 files)
- localPos()→position() (lts_height_plot_widget)
- setMargin→setContentsMargins (tests/window.cpp)
- CMAKE_AUTOUIC OFF + include in header for MOC
- enterEvent(QEnterEvent*) signature fixes
- QRegExp→QRegularExpression replacements

All LtsWidgets module files now Qt6-compatible.

qt6-after/qt6-migrated-legatus/Lts/Common/LtsWidgets/lts_text_editor.cpp

@@ -83,7 +83,7 @@ LtsTextEditor::LtsTextEditor(QWidget *parent)
   slotBackgroundColorChanged(m_backgroundColor);
 
 
-  connect(m_ui->cbFonts, QOverload<const QString &>::of(&QComboBox::activated),
+  connect(m_ui->cbFonts, QOverload<int>::of(&QComboBox::activated),
           this, &LtsTextEditor::slotTextFamily);
 
   const QList<int> standardSizes = QFontDatabase::standardSizes();
@@ -91,7 +91,7 @@ LtsTextEditor::LtsTextEditor(QWidget *parent)
     m_ui->cbFontSize->addItem(QString::number(size));
   m_ui->cbFontSize->setCurrentIndex(standardSizes.indexOf(QApplication::font().pointSize()));
 
-  connect(m_ui->cbFontSize, QOverload<const QString &>::of(&QComboBox::activated),
+  connect(m_ui->cbFontSize, QOverload<int>::of(&QComboBox::activated),
           this, &LtsTextEditor::slotTextSize);
 
   connect(m_ui->cbFontSize->lineEdit(), &QLineEdit::editingFinished,
@@ -187,8 +187,9 @@ void LtsTextEditor::slotTextItalic()
 }
 
 
-void LtsTextEditor::slotTextFamily(const QString &f)
+void LtsTextEditor::slotTextFamily(int index)
 {
+  Q_UNUSED(index);
   QTextCharFormat fmt;
   if (m_ui->textEdit->document()->isEmpty())
   {
@@ -200,14 +201,17 @@ void LtsTextEditor::slotTextFamily(const QString &f)
     fmt.setFontPointSize(pointSize);
     fmt.setForeground(m_foregroundColor);
   }
+  const QString f = m_ui->cbFonts->currentText();
   fmt.setFontFamily(f);
   fmt.setFontFamilies({f});
   slotMergeFormatOnWordOrSelection(fmt);
 }
 
 
-void LtsTextEditor::slotTextSize(const QString &p)
+void LtsTextEditor::slotTextSize(int index)
 {
+  Q_UNUSED(index);
+  const QString p = m_ui->cbFontSize->currentText();
   qreal pointSize = p.toFloat();
 
   if (p.toFloat() > 0)