code: def checkCursor(self):
          'override Sheet.checkCursor'
          if self.cursorBox:
              if self.cursorBox.h < self.canvasCharHeight:
                  self.cursorBox.h = self.canvasCharHeight*3/4
              if self.cursorBox.w < self.canvasCharWidth:
                  self.cursorBox.w = self.canvasCharWidth*3/4
  
          return Falsf checkCursor(self):
          'override Sheet.checkCursor'
          if self.cursorBox:
              if self.cursorBox.h < self.canvasCharHeight:
                  self.cursorBox.h = self.canvasCharHeight*3/4
              if self.cursorBox.w < self.canvasCharWidth:
                  self.cursorBox.w = self.canvasCharWidth*3/4
  
          return False
docs: override Sheet.checkCursor