Introduce the new client property for mac: apple.awt.windowTitleVisible

Summary

Control window title text visibility by a new client property in AWT on macOS.

Problem

Rich client applications (IntelliJ IDEA for example) need control over window title rendering to provide custom decoration in full content window mode (enabled by apple.awt.fullWindowContent property).

Solution

Extend the macOS AWT by a client property corresponding to the boolean attribute "titleVisibility" of native windows. The attribute controls the visibility of the title text. The new client property is applied to the root panes of windows.

Specification

The new property follows the format of some existing properties:

"apple.awt.windowTitleVisible"

See CPlatformWindow.java for a complete list.