RFR: 8324327: ColorPicker shows a white rectangle on clicking on picker

[Ambarish Rapte]

On Thu, 16 May 2024 18:30:17 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

> Root cause: premature 'return' from initialization code leaves the hover square visible, even when it should be hidden, as the case is when the color value is not present in the palette.
> 
> - added unit tests

Fix looks good, I think a single reviewer is sufficient for this. But please do wait for a while, may be for a day before integrating.

I do have an observation to share:
Another way to look at the root cause of the issue is that the `hoverSquare`'s  visible property is not initialized in the `ColorPalette` constructor.  
The `hoverSquare` should **not** be visible by default, so adding this `hoverSquare.setVisible(false);` to `ColorPalette` constructor also solves the problem.
Compared to PR change, this would avoid setting the visible property of focusSquare to false repeatedly in scenario when user keeps selecting custom color repeatedly.

Anyway the fix is good, approving.
Shall re-approve if you make any change.

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Marked as reviewed by arapte (Reviewer).

PR Review: https://git.openjdk.org/jfx/pull/1458#pullrequestreview-2062612821