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

[Martin Fox]

On Tue, 9 Jan 2024 00:17:33 GMT, Andy Goryachev <angorya 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).
>
> modules/javafx.graphics/src/main/native-glass/mac/GlassView3D.m line 814:
> 
>> 812:     NSRect result = [self->_delegate getInputMethodCandidatePosRequest:0];
>> 813:     if (NSScreen.screens.count) {
>> 814:         NSRect screenFrame = NSScreen.screens[0].frame;
> 
> I assume this code block is not entered in the case of a single monitor?

Yes, it is entered if there's a single monitor (NSScreen.screens.count will be 1). We always have to flip the y coordinate.

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PR Review Comment: https://git.openjdk.org/jfx/pull/1313#discussion_r1445522864