QmlDesigner: Improve Go To Component

This improves the signals present in "Go To Component"
or "Add Signal Handler".
For some controls we have to offer property changed signal
handler as first options.
We simply hard code properties which are likely to be handled.

Change-Id: Ide26589534d6d058f1b60afcc6353c4f0340cb22
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/plugins/qmldesigner/components/componentcore/addsignalhandlerdialog.cpp

@@ -55,6 +55,21 @@ QString AddSignalHandlerDialog::signal() const
     return m_signal;
 }
 
+bool checkForPropertyChanges(const QString &signal)
+{
+    static const QStringList importantProperties = {"pressed","position","value",
+                                             "checked","currentIndex","index",
+                                             "text","currentText", "currentItem"};
+    if (!signal.endsWith("Changed"))
+        return true;
+
+    QString property = signal;
+    property.chop(7);
+
+    /* Some important property changes we keep */
+    return importantProperties.contains(property);
+}
+
 void AddSignalHandlerDialog::updateComboBox()
 {
     m_ui->comboBox->clear();
@@ -62,12 +77,10 @@ void AddSignalHandlerDialog::updateComboBox()
         if (m_ui->all->isChecked()) {
             m_ui->comboBox->addItem(signal);
         } else if (m_ui->properties->isChecked()) {
-            if (signal.contains(QLatin1String("Changed")))
-                m_ui->comboBox->addItem(signal);
-        } else {
-            if (!signal.contains(QLatin1String("Changed")))
+            if (signal.endsWith("Changed"))
                 m_ui->comboBox->addItem(signal);
-        }
+        } else if (checkForPropertyChanges(signal))
+            m_ui->comboBox->addItem(signal);
     }
 }