[jbosstools-issues] [JBoss JIRA] (ERT-765) [GTK] Nothing is rendered when creating new GC on canvas [EBZ#551982]

[Friendly Jira Robot (Jira)]

Friendly Jira Robot created ERT-765:
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             Summary: [GTK] Nothing is rendered when creating new GC on canvas [EBZ#551982]
                 Key: ERT-765
                 URL: https://issues.jboss.org/browse/ERT-765
             Project: Eclipse Release Train
          Issue Type: Task
          Components: Platform
            Reporter: Friendly Jira Robot


This is example from http://www.java2s.com/Tutorial/Java/0300__SWT-2D-Graphics/Graphics.htm
It shows empty window when run on Ubuntu 18.04 with open jdk 1.8
Mac and Windows works fine.
Also works if use e.gc instead of new GC(...)

It used to work before
Swt used
org.eclipse.swt.gtk.linux.x86_64_3.111.0.v20190605-1801.jar






import org.eclipse.swt.SWT;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

public class GCCreateFrom {
	public static void main(String[] args) {
		Display display = new Display();
		Shell shell = new Shell(display);
		shell.setText("Canvas Example");
		shell.setLayout(new FillLayout());
		final Canvas canvas = new Canvas(shell, SWT.NONE);
		canvas.addPaintListener(new PaintListener() {
			@Override
			public void paintControl(PaintEvent e) {
				GC gc = new GC(canvas);
				gc.setForeground(e.display.getSystemColor(SWT.COLOR_RED));
				gc.drawFocus(5, 5, 200, 10);
				gc.drawText("You can draw text directly on a canvas", 60, 60);
				gc.dispose();
			}
		});
		shell.open();
		while (!shell.isDisposed()) {
			if (!display.readAndDispatch()) {
				display.sleep();
			}
		}
		display.dispose();
	}
}



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