Fixed crash on exit. Fixes #520.

common/lc_model.cpp

@@ -266,13 +266,7 @@ void lcModel::DeleteModel()
 	lcReleaseTexture(mBackgroundTexture);
 	mBackgroundTexture = nullptr;
 
-	if (mIsPreview && gPreviewWidget) {
-		lcCamera* Camera = gPreviewWidget->GetCamera();
-
-		if (Camera && !Camera->IsSimple() && mCameras.FindIndex(Camera) != -1)
-			gPreviewWidget->SetCamera(Camera);
-	}
-	else if (gMainWindow)
+	if (gMainWindow)
 	{
 		const lcArray<View*>* Views = gMainWindow->GetViewsForModel(this);
 

common/lc_partselectionwidget.cpp

@@ -716,6 +716,7 @@ void lcPartSelectionListView::PreviewSelection(int InfoIndex)
 
 	if (Preview && ViewWidget)
 	{
+		ViewWidget->setAttribute(Qt::WA_DeleteOnClose, true);
 		if (!Preview->SetCurrentPiece(Info->mFileName, ColorCode))
 			QMessageBox::critical(gMainWindow, tr("Error"), tr("Preview %1 failed.").arg(Info->mFileName));
 		ViewWidget->SetPreviewPosition(rect());

common/lc_previewwidget.cpp

@@ -11,8 +11,6 @@
 
 #include "lc_qglwidget.h"
 
-lcPreviewWidget* gPreviewWidget;
-
 lcPreviewDockWidget::lcPreviewDockWidget(QMainWindow* Parent)
 	: QMainWindow(Parent)
 {
@@ -104,8 +102,6 @@ lcPreviewWidget::~lcPreviewWidget()
 		delete mCamera;
 
 	delete mLoader;
-
-	gPreviewWidget = nullptr;
 }
 
 bool lcPreviewWidget::SetCurrentPiece(const QString& PartType, int ColorCode)

common/lc_previewwidget.h

@@ -149,5 +149,3 @@ protected:
 	int mMouseDownX;
 	int mMouseDownY;
 };
-
-extern lcPreviewWidget* gPreviewWidget;