forward declaration of unique_ptr (#9708)

Author: 3nids

python/gui/auto_generated/qgsexpressionlineedit.sip.in

@@ -38,6 +38,7 @@ Constructor for QgsExpressionLineEdit.
 
 :param parent: parent widget
 %End
+    ~QgsExpressionLineEdit();
 
     void setExpressionDialogTitle( const QString &title );
 %Docstring

src/gui/qgsexpressionlineedit.cpp

@@ -46,6 +46,8 @@ QgsExpressionLineEdit::QgsExpressionLineEdit( QWidget *parent )
                      << QgsExpressionContextUtils::projectScope( QgsProject::instance() );
 }
 
+QgsExpressionLineEdit::~QgsExpressionLineEdit() = default;
+
 void QgsExpressionLineEdit::setExpressionDialogTitle( const QString &title )
 {
   mExpressionDialogTitle = title;

src/gui/qgsexpressionlineedit.h

@@ -19,7 +19,6 @@
 #include <QWidget>
 #include "qgis_sip.h"
 #include "qgsexpressioncontext.h"
-#include "qgsdistancearea.h"
 #include "qgis_gui.h"
 #include <memory>
 
@@ -57,6 +56,7 @@ class GUI_EXPORT QgsExpressionLineEdit : public QWidget
      * \param parent parent widget
      */
     explicit QgsExpressionLineEdit( QWidget *parent SIP_TRANSFERTHIS = nullptr );
+    ~QgsExpressionLineEdit() override;
 
     /**
      * Sets the title used in the expression builder dialog