RFR: 8305578: X11GraphicsDevice.pGetBounds() is slow in remote X11 sessions

[Nikita Gubarkov]

On Wed, 5 Apr 2023 08:19:50 GMT, Maxim Kartashev <mkartashev at openjdk.org> wrote:

> Getting bounds of a `GraphicsDevice` and insets of a screen are fairly frequent operations. When working over the network (remote X session), those can take several *seconds* to complete, introducing repeated freezes even when typing in an editor feels only slightly sluggish.
> 
> On the other hand, neither bounds nor insets change very often - if at all - during the lifetime of an application. So caching their values seems like a natural solution to the problem. The caches need to be reset only when there's a possibility of change in the screens configuration.
> 
> A similar patch has been living in [JetBrains Runtime](https://github.com/JetBrains/JetBrainsRuntime/) for well over a year.

As for me, even 1ms per call is already too much for coordinate conversion functions.

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PR Comment: https://git.openjdk.org/jdk/pull/13346#issuecomment-1501555363