Set adjustment rules for combobox within foreign key editor

src/ForeignKeyEditorDelegate.cpp

@@ -18,6 +18,7 @@ public:
         , clauseEdit(new QLineEdit(this))
         , m_btnReset(new QPushButton(tr("&Reset"), this))
     {
+        idsComboBox->setSizeAdjustPolicy(QComboBox::AdjustToContents);
         clauseEdit->setPlaceholderText(tr("(foreign key clauses(ON UPDATE, ON DELETE etc.)"));
 
         QHBoxLayout* layout = new QHBoxLayout(this);