RFR: 8301893: IME window position is off on secondary screen

[Kevin Rushforth]

On Wed, 27 Dec 2023 00:01:10 GMT, Martin Fox <mfox at openjdk.org> wrote:

> The Mac screen coordinate system is inverted on the y-axis compared to JavaFX so glass needs to flip the y coordinate. IM coordinates are relative to the primary screen which is NSScreen.screens[0], not NSScreen.mainScreen (mainScreen is the screen that contains the window that has focus).

@andy-goryachev-oracle Can you be the second reviewer?

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PR Comment: https://git.openjdk.org/jfx/pull/1313#issuecomment-1879724473