QLineEdit's clear action takes up space even when not visible

QLineEdit clear action's isVisible() returns always true, even when the button of the action is not actually visible in the line edit. If there is another custom action in the line edit, the (invisible) clear button will just waste space. The attached minimal test case reproduces the issue: there shouldn't be any white space between the red square (which is the custom action) and the right end of the line edit.