RFR: 8267374: (macos) Left Option+Up/Down arrow dont traverse to beginning/end of line in textarea

[Prasanta Sadhukhan]

On Thu, 23 Jun 2022 06:41:08 GMT, Prasanta Sadhukhan <psadhukhan at openjdk.org> wrote:

> > > Right option key does not work at all...Left option key worked for left-right but not for up-down..this PR addresses that left option key up/down issue..
> > 
> > 
> > But the right key worked in jdk8, no?
> 
> Right Option Key worked for left-right, not for up-down in jdk8..in fact it stopped working from jdk9-b120 even for left-right it seems.. BTW, what is the keycode for Right Option Key? Is it VK_ALT_GRAPH?

[JDK-8151136](https://bugs.openjdk.org/browse/JDK-8151136) regressed Right Option Key working for making test/java/awt/event/MouseEvent/AltGraphModifierTest/AltGraphModifierTest.java work which only tests for Linux as per manual instruction so no need to test it for mac

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PR: https://git.openjdk.org/jdk/pull/9230