How to maximise a window to fill up screen in Mavericks? Before Mavericks, I could maximise a window while holding shift key, and the window would always fill up the entire screen without needing any third party tools or changes.

It no longer works in Mavericks, is there a workaround or hidden setting to revert to the old behavior?
While holding Shift + Option, click the green Plus button on the upper-left corner of the window.