Fixed underflow error on worldpos.

tools/editortool/maptool.py

@@ -16,6 +16,9 @@ class MapWindow(QMainWindow):
   def __init__(self):
     super().__init__()
 
+    self.insertPressed = False
+    self.deletePressed = False
+
     # Subclasses
     self.map = Map(self)
     self.camera = Camera(self)
@@ -104,18 +107,37 @@ class MapWindow(QMainWindow):
 
       if amtX != 0 or amtY != 0 or amtZ != 0:
         self.map.moveRelative(amtX, amtY, amtZ)
+        if self.insertPressed:
+          tile = self.map.getTileAtWorldPos(*self.map.position)
+          if tile is not None and tile.shape == TILE_SHAPE_NULL:
+            tile.setShape(TILE_SHAPE_FLOOR)
+        if self.deletePressed:
+          tile = self.map.getTileAtWorldPos(*self.map.position)
+          if tile is not None:
+            tile.setShape(TILE_SHAPE_NULL)
         event.accept()
         return True
       
       if key == Qt.Key_Delete:
         tile = self.map.getTileAtWorldPos(*self.map.position)
+        self.deletePressed = True
         if tile is not None:
           tile.setShape(TILE_SHAPE_NULL)
         event.accept()
         return True
       if key == Qt.Key_Insert:
         tile = self.map.getTileAtWorldPos(*self.map.position)
+        self.insertPressed = True
         if tile is not None and tile.shape == TILE_SHAPE_NULL:
           tile.setShape(TILE_SHAPE_FLOOR)
         event.accept()
+    elif event.type() == event.KeyRelease:
+      key = event.key()
+      if key == Qt.Key_Delete:
+        self.deletePressed = False
+        event.accept()
+        return True
+      if key == Qt.Key_Insert:
+        self.insertPressed = False
+        event.accept()
     return super().eventFilter(obj, event)