It is normal for Qt programs (at-least on windows) to use lesser memory than before minimizing. But this does not mean that your application does not have any memory leaks.
Often developers will see that the actual memory leaks in the application are masked by this behavior. You will need to find other ways to detect memory leaks, like run the application for long hours with full load, or using some memory/program analysis tools
When you know how to do it then you may do it wrong.
When you don't know how to do it then it is not that you may do it wrong but you may not do it right.
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