QWidgetTextControl: port to new-style connects (faster)

This speeds up creating a QGraphicsTextItem by 14% in an optimized build
Before: 0.070 msecs per iteration
After: 0.060 msecs per iteration

Those connects were showing up when profiling, because of the string
parsing that is necessary when using SIGNAL/SLOT macros.
The stacktrace was connect() => decodeMethodSignature() => argumentTypesFromString()
=> QArgumentType constructor => qMetaTypeInternal(const char*).

Pick-to: 6.3 6.2 5.15
Change-Id: I3cf5655c5450f121005140bdb587fafa083cce6a
Reviewed-by: Volker Hilsheimer <[email protected]>

1 files changed, 4 insertions, 2 deletions

diff --git a/src/gui/text/qabstracttextdocumentlayout.cpp b/src/gui/text/qabstracttextdocumentlayout.cpp
index 90726100e23..1a0d045f42d 100644
--- a/src/gui/text/qabstracttextdocumentlayout.cpp
+++ b/src/gui/text/qabstracttextdocumentlayout.cpp
@@ -435,7 +435,8 @@ void QAbstractTextDocumentLayout::registerHandler(int objectType, QObject *compo
     if (!iface)
         return; // ### print error message on terminal?
 
-    connect(component, SIGNAL(destroyed(QObject*)), this, SLOT(_q_handlerDestroyed(QObject*)));
+    QObjectPrivate::connect(component, &QObject::destroyed, d,
+                            &QAbstractTextDocumentLayoutPrivate::_q_handlerDestroyed);
 
     QTextObjectHandler h;
     h.iface = iface;
@@ -456,7 +457,8 @@ void QAbstractTextDocumentLayout::unregisterHandler(int objectType, QObject *com
     const auto it = d->handlers.constFind(objectType);
     if (it != d->handlers.cend() && (!component || component == it->component)) {
         if (component)
-            disconnect(component, SIGNAL(destroyed(QObject*)), this, SLOT(_q_handlerDestroyed(QObject*)));
+            QObjectPrivate::disconnect(component, &QObject::destroyed, d,
+                                       &QAbstractTextDocumentLayoutPrivate::_q_handlerDestroyed);
         d->handlers.erase(it);
     }
 }