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BUG? No chart refresh when automatic scrolling is disabled

I was woundering that there is sometimes no chart refresh when the automatic scrolling mechanism is disabled. The (bid /ask) price line is updated on new tick data but candle sticks, etc. are not. The problem occures when a chart shift is needed. In MT4 it worked without any problems. It seems to be

Non-deterministic Behavior with CChartObjectButton.State() method - bug??

To Development team of MQL5, I don't understand why the hell the State() method shows non-deterministic behavior when I use it to check if a CChartObjectButton is "pressed" or not! Wenn I press both buttons and move both lines, it looks like this: When I wait some time and do nothing it looks like