For me it works fine.
You need to open the map BEFORE running the script.
Your light blue triangle icon will chnage its size 5 times from normal to big and back, starting a kind of a flickering.
You can change the size in the SetDimensions(width, height) function parameters.
And the time between the flickers in milliseconds in the first function part
delay = i*400
Sometimes it only blinks 4 times instead of 5. I realised that if you lower the milliseconds below 250 it won't be changing enough to notice it anymore.
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