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_height_plot_widget.cpp

@@ -356,8 +356,7 @@ void LtsHeightPlotWidget::Private::repaint()
   QImage img(m_curSize, QImage::Format_ARGB32);
   img.fill(Qt::transparent);
   QPainter p(&img);
-  const QPainter::RenderHints hints = QPainter::HighQualityAntialiasing |
-                                      QPainter::SmoothPixmapTransform |
+  const QPainter::RenderHints hints = QPainter::SmoothPixmapTransform |
                                       QPainter::TextAntialiasing |
                                       QPainter::Antialiasing;
   p.setRenderHints(hints);
@@ -416,7 +415,7 @@ void LtsHeightPlotWidget::Private::repaint()
     const QPointF p1(-20, y);
     const QString str = QString::number(i);
     QRectF r = fm.boundingRect(str);
-    r.setWidth(fm.width(str));    // important, see docu!
+    r.setWidth(fm.horizontalAdvance(str));    // important, see docu!
     r.moveTo(p1.x() - r.width() / 2., p1.y() - r.height() / 2.);
     p.drawText(r, str, Qt::AlignHCenter | Qt::AlignVCenter);
   }
@@ -447,7 +446,7 @@ void LtsHeightPlotWidget::Private::repaint()
     const QPointF p1(point.x(), point.y() + 15);
     const QString str = QString::number(i);
     QRectF r = fm.boundingRect(str);
-    r.setWidth(fm.width(str));    // important, see docu!
+    r.setWidth(fm.horizontalAdvance(str));    // important, see docu!
     r.moveTo(p1.x() - r.width() / 2., p1.y() - r.height() / 2.);
     p.drawText(r, str, Qt::AlignHCenter | Qt::AlignVCenter);
   }
@@ -526,7 +525,7 @@ void LtsHeightPlotWidget::setMarks(const QVector<QPointF> &data)
 void LtsHeightPlotWidget::setBackgroundBrush(const QBrush &brush)
 {
   QPalette pal = palette();
-  pal.setBrush(QPalette::Background, brush);
+  pal.setBrush(QPalette::Window, brush);
   setPalette(pal);
 }
 
@@ -594,7 +593,7 @@ void LtsHeightPlotWidget::mouseMoveEvent(QMouseEvent *e)
   if (!d->m_heightList.count())
     return;
 
-  const QPointF pos = d->m_transInverted.map(e->localPos());
+  const QPointF pos = d->m_transInverted.map(e->position());
   emit mousePositionChanged(d->getDataPos(pos.x()), d->getDataHeight(pos.x()), pos.y());
   d->m_mousePos = pos;
   update();