Generating corrupted PPT when using connectors

[srivkrnt]

I have observed an issue recently with the library where the generated PPT doesn't open in Google Slides and Microsoft Powerpoint

You can have a look at the below example

for i in range(len(positions) - 1):
    keys = list(positions.keys())
    start_shape = shapes[keys[i]]
    end_shape = shapes[keys[i + 1]]
    
    # Calculate the absolute positions for start and end points
    start_left = start_shape.left + start_shape.width
    start_top = start_shape.top + start_shape.height / 2
    end_left = end_shape.left
    end_top = end_shape.top + end_shape.height / 2

    connector = slide.shapes.add_connector(
        MSO_CONNECTOR.CURVE,
        start_left,
        start_top,
        end_left,
        end_top
    )

I have observed that when the start_top and end_top are not integers because of the division. The PPT generated doesn't open in Google Slides and Microsoft PPT.

start_top = start_shape.top + int(start_shape.height / 2)
end_top = end_shape.top + int(end_shape.height / 2)

and this fixes the issue. I was thinking of moving this inside the library itself, so that even if the client sends a non-int value, it can be cast to a int value and the PPT generated will be valid.

Let me know if I can raise of PR for this @scanny