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

[Eric Williams (Jira)]

     [ https://issues.jboss.org/browse/ERT-742?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eric Williams reassigned ERT-742:
---------------------------------

      Sprint: devex #169 July 2019
    Assignee: Eric Williams


> [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
>            Assignee: Eric Williams
>            Priority: Major
>              Labels: 4.13_M3, SWT, bzira
>
> 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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