Clamp widgets coordinates to avoid crashes

apps/opencs/view/doc/view.cpp

@@ -1110,7 +1110,16 @@ void CSVDoc::View::updateWidth(bool isGrowLimit, int minSubViewWidth)
 {
     QRect rect;
     if (isGrowLimit)
-        rect = QApplication::screenAt(pos())->geometry();
+    {
+        // Widget position can be negative, we should clamp it.
+        QPoint position = pos();
+        if (position.x() <= 0)
+            position.setX(0);
+        if (position.y() <= 0)
+            position.setY(0);
+
+        rect = QApplication::screenAt(position)->geometry();
+    }
     else
         rect = desktopRect();
 

apps/opencs/view/world/tablesubview.cpp

@@ -78,8 +78,16 @@ CSVWorld::TableSubView::TableSubView(
     widget->setLayout(layout);
 
     setWidget(widget);
+
+    // Widget position can be negative, we should clamp it.
+    QPoint position = pos();
+    if (position.x() <= 0)
+        position.setX(0);
+    if (position.y() <= 0)
+        position.setY(0);
+
     // prefer height of the screen and full width of the table
-    const QRect rect = QApplication::screenAt(pos())->geometry();
+    const QRect rect = QApplication::screenAt(position)->geometry();
     int frameHeight = 40; // set a reasonable default
     QWidget* topLevel = QApplication::topLevelAt(pos());
     if (topLevel)