TerraTheme.darken(Color) doesn't preserve alpha channel
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Key: PIVOT-496
URL: https://issues.apache.org/jira/browse/PIVOT-496
Project: Pivot
Issue Type: Bug
Components: wtk-terra
Affects Versions: 1.4, 1.5
Reporter: Dirk Moebius
Priority: Minor
A color with alpha value which is darkened through TerraTheme.darken(Color)
looses its alpha channel. This happens eg. with the borders around a TextArea.
As a result, you cannot currently have a TextArea with transparent borders.
The same applies to TerraTheme.brighten(Color).
The error is in TerraTheme.adjustBrightness(Color color, float adjustment). It
creates a new Color instance but invokes the wrong constructor so the alpha
channel gets masked out.
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