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_tool_bar_area.cpp

@@ -18,6 +18,7 @@
 #include <QMenu>
 #include <QShortcut>
 #include <QPointer>
+#include <utility>
 
 
 namespace LtsWidgets
@@ -191,7 +192,7 @@ void LtsToolBarArea::dropEvent(QDropEvent *event)
   LtsDragIcon *source = qobject_cast<LtsDragIcon *>(event->source());
   // does not work when not dragged on a LtsDragIcon ... should be ok for now
   LtsDragIcon *after = nullptr;
-  QWidget *w = childAt(event->pos());
+  QWidget *w = childAt(event->position().toPoint());
   while (w)
   {
     after = qobject_cast<LtsDragIcon *>(w);
@@ -212,7 +213,7 @@ QMenu *LtsToolBarArea::functionKeyMenu(QWidget *parent)
   {
     ShortCut &shorty = val.value();
     act = menu->addAction(QStringLiteral("%1%2").arg(shorty.keyName(), !shorty.name.isEmpty() ? QStringLiteral(" - %1").arg(shorty.name) : QString()));
-    act->setData(shorty.shortcut->key()[0]);
+    act->setData(shorty.shortcut->key()[0].toCombined());
     connect(act, &QAction::triggered, this, &LtsToolBarArea::functionKeyMenuTriggered);
   }
   menu->addSeparator();
@@ -264,7 +265,7 @@ bool LtsToolBarArea::setFunctionKey(int fkey, const QString &action)
 
   // Icon available?
   LtsDragIcon *icon = nullptr;
-  for (LtsDragIcon *ic : qAsConst(m_buttonMap))
+  for (LtsDragIcon *ic : std::as_const(m_buttonMap))
   {
     if (ic->identifier() == action)
     {
@@ -280,7 +281,7 @@ bool LtsToolBarArea::setFunctionKey(int fkey, const QString &action)
   ShortCut &shorty = m_functionKeys[fkey];
 
   // Remove key symbol from any icon
-  for (LtsDragIcon *ic : qAsConst(m_buttonMap))
+  for (LtsDragIcon *ic : std::as_const(m_buttonMap))
     if (ic->identifier() == shorty.identifier)
       ic->removeModification();
 
@@ -327,7 +328,7 @@ void LtsToolBarArea::removeMenuAction(LtsDragIcon *icon)
     if (itShortcut.identifier == icon->identifier())
       itShortcut.clear();
   }
-  for (LtsDragIcon *ic : qAsConst(m_foreignButtonMap))
+  for (LtsDragIcon *ic : std::as_const(m_foreignButtonMap))
   {
     if(ic->identifier() == icon->identifier())
     {