RFR: 8258970: Disabled JPasswordField foreground color is wrong with GTK LAF

[Tejesh R]

On Mon, 14 Aug 2023 03:31:37 GMT, Abhishek Kumar <abhiscxk at openjdk.org> wrote:

> Disabled JPasswordField foreground color was not grayed out in GTK LAF.
> 
> The foreground color in disabled state was close to black color (RGB 0,0,0) for password field which is not differentiable from enabled state foreground color.
> 
> To fix for this problem, the widget type is changed to `TEXT_AREA `for disable password field which returns the foreground color as gray. Checked with Oracle linux as well and fix worked fine.
> 
> An automated test case has been added and checked in CI, link is added in JBS. Test mentioned in JBS also works fine with the fix.

Same observation holds for JTextField and hope other remaining two (SPINNER_TEXT_FIELD and FORMATTED_TEXT_FIELD) also, consolidating and finding a fix which applies to all four (TEXT_FIELD, PASSWORD_FIELD, SPINNER_TEXT_FIELD and FORMATTED_TEXT_FIELD) might be optimal.

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PR Review: https://git.openjdk.org/jdk/pull/15263#pullrequestreview-1581799618