improve layouts elements interaction in config

--use DoubleClick to change ShowInMenu
--dont change Activities when Activities combobox
loses focus, only when the user has really clicked
an element
--select user-set backgrounds properly when showing
the combobox backgrounds popup

app/layoutsDelegates/activitycmbboxdelegate.cpp

@@ -44,7 +44,12 @@ ActivityCmbBoxDelegate::ActivityCmbBoxDelegate(QObject *parent)
 
 QWidget *ActivityCmbBoxDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const
 {
-    QComboBox *editor = new QComboBox(parent);
+    QComboBox *editor =  new QComboBox(parent);
+
+    //! use focusPolicy as flag in order to update activities only when the user is clicking in the popup
+    //! it was the only way I found to communicate between the activated (const) signal and the
+    //! setEditorData (const) function
+    editor->setFocusPolicy(Qt::StrongFocus);
 
     QStringList assignedActivities = index.model()->data(index, Qt::UserRole).toStringList();
     QStringList availableActivities = m_settingsDialog->availableActivities();
@@ -74,6 +79,7 @@ QWidget *ActivityCmbBoxDelegate::createEditor(QWidget *parent, const QStyleOptio
     }
 
     connect(editor, static_cast<void(QComboBox::*)(int)>(&QComboBox::activated), [ = ](int index) {
+        editor->setFocusPolicy(Qt::ClickFocus);
         editor->clearFocus();
     });
 
@@ -98,6 +104,12 @@ void ActivityCmbBoxDelegate::setModelData(QWidget *editor, QAbstractItemModel *m
 {
     QComboBox *comboBox = static_cast<QComboBox *>(editor);
 
+    if (editor->focusPolicy() != Qt::ClickFocus) {
+        return;
+    }
+
+    editor->setFocusPolicy(Qt::StrongFocus);
+
     QStringList assignedActivities = index.model()->data(index, Qt::UserRole).toStringList();
     QString selectedActivity = comboBox->currentData().toString();
 

app/layoutsDelegates/checkboxdelegate.cpp

@@ -61,7 +61,7 @@ bool CheckBoxDelegate::editorEvent(QEvent *event, QAbstractItemModel *model, con
 //         return false;
 
     // make sure that we have the right event type
-    if (event->type() == QEvent::MouseButtonRelease) {
+    if (event->type() == QEvent::MouseButtonDblClick) {
         if (!option.rect.contains(static_cast<QMouseEvent *>(event)->pos()))
             return false;
     } else if (event->type() == QEvent::KeyPress) {

app/layoutsDelegates/colorcmbboxdelegate.cpp

@@ -107,7 +107,7 @@ void ColorCmbBoxDelegate::setEditorData(QWidget *editor, const QModelIndex &inde
     int pos = Colors.indexOf(value);
 
     if (pos == -1 && value.startsWith("/")) {
-        comboBox->setCurrentIndex(Colors.count() - 1);
+        comboBox->setCurrentIndex(Colors.count());
     } else {
         comboBox->setCurrentIndex(Colors.indexOf(value));
     }