RFR: 8289539: The color returned by CheckBox.interiorBackground is incorrect

[Tejesh R]

On Thu, 22 Sep 2022 06:59:59 GMT, Tejesh R <tr at openjdk.org> wrote:

> The color returned for `InteriorBackground` property is the default color used for only _WindowsClassicLookAndFeel_. For _WindowsLookAndFeel_ the `InteriorBackground` color is not been used when checkbox paint happens. In _WindowsLookAndFeel_ the CheckBox check/uncheck is drawn using `ImageCache` which is totally independent of `InteriorBackground` color in which the user expects it to be.
> The proposed fix is to return null for _WindowsLookAndFeel_ (which is what happens in other LookAndFeel like Metal/Synth/Motif/Aqua ) and return default color which is the actual color used in _WindowsClassicLookAndFeel_.

> 

In other L&F there is no such `checkbox.interiorBackground` property hence it is null value when user tries to access it. In windows since in Classic its been used, that property exist for windowsL&F also (Which is not using that property). And also in Windows L&F I couldn't find a way to change the interior background of checkbox as in WindowsClassic, since the image is painted using ImageCache.

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PR: https://git.openjdk.org/jdk/pull/10385