[2.8] Be more selective when filter the mouse release events. #4279
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This is an attempt to fix this type of problems: #4044, partially reverted this commit 0b7cbf8
The last one was produced with the intention of filter out button-release events while a popup is opening, to avoid unintentional selection of popup items due to busy event handling. But also this prevented capture the button-release events in other actors who need to know the status of the mouse, leaving in an inconsistent state some applets.