[jbosstools-issues] [JBoss JIRA] (ERT-742) [GTK] Label background set from parent background, but the colors are not equal [EBZ#549101]

[Friendly Jira Robot (Jira)]

Friendly Jira Robot created ERT-742:
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             Summary: [GTK] Label background set from parent background, but the colors are not equal [EBZ#549101]
                 Key: ERT-742
                 URL: https://issues.jboss.org/browse/ERT-742
             Project: Eclipse Release Train
          Issue Type: Task
          Components: Platform
            Reporter: Friendly Jira Robot


To reproduce, run the following snippet:

public static void main(String[] args) throws Exception {
	final Display display = new Display();
	Shell shell = new Shell(display);
	shell.setSize(500, 80);
	shell.setLayout(new FillLayout(SWT.HORIZONTAL));
	shell.setText("Bug");

	Composite co = new Composite(shell, SWT.NONE);
	co.setLayout(new FillLayout(SWT.HORIZONTAL));
	Label l = new Label(co, SWT.NONE);
	l.setBackground(co.getBackground());

	boolean equalColors = l.getBackground().equals(co.getBackground());
	l.setText("colors equal: " + equalColors);
	
	shell.open();

	while (!shell.isDisposed()) {
		if (!display.readAndDispatch()) {
			display.sleep();	
		}
	}
	display.dispose();
}

Observe that the label text indicates, that the background color of the label is not the same as that of its parent. Although the snippet explicitly sets the same color.

Seems to be a regression from bug 548286: https://git.eclipse.org/c/platform/eclipse.platform.swt.git/commit/?id=2d8c4271d38bd3d3777f952bb1cd8cf99b3d9853

Prior to this change, the colors are equal. The difference is in some fractions of all the colors (RGB).

We see this with latest Eclipse SDK 4.13, on RHEL 7.4 with GTK3. No idea if its also seen on Windows 7/10 or Mac.



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