Shell.setSize not doen under Ubuntu 18.10

[vogella]

If I run the following test under Ubuntu 18.10 the Shell.setSize does not result in an update Workbench window, only the cursor is flickering.

@odockal suggested on the Mattermost channel to open an issue for this. https://mattermost.eclipse.org/eclipse/channels/reddeer

package org.reddeer.test;

import org.eclipse.reddeer.eclipse.jdt.ui.wizards.JavaProjectWizard;
import org.eclipse.reddeer.eclipse.jdt.ui.wizards.NewClassCreationWizard;
import org.eclipse.reddeer.eclipse.jdt.ui.wizards.NewClassWizardPage;
import org.eclipse.reddeer.eclipse.jdt.ui.wizards.NewJavaProjectWizardPageOne;
import org.eclipse.reddeer.eclipse.ui.perspectives.JavaPerspective;
import org.eclipse.reddeer.eclipse.ui.views.markers.ProblemsView;
import org.eclipse.reddeer.junit.runner.RedDeerSuite;
import org.eclipse.reddeer.requirements.cleanworkspace.CleanWorkspaceRequirement.CleanWorkspace;
import org.eclipse.reddeer.requirements.openperspective.OpenPerspectiveRequirement.OpenPerspective;
import org.eclipse.reddeer.swt.api.StyledText;
import org.eclipse.reddeer.swt.impl.styledtext.DefaultStyledText;
import org.eclipse.reddeer.workbench.impl.editor.DefaultEditor;
import org.eclipse.reddeer.workbench.impl.shell.WorkbenchShell;
import org.eclipse.reddeer.workbench.impl.view.WorkbenchView;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.junit.Test;
import org.junit.runner.RunWith;

/**
 */
@RunWith(RedDeerSuite.class)
@CleanWorkspace  
@OpenPerspective(JavaPerspective.class) 

public class RedDeerTest {

	private WorkbenchView projectExplorer;
	private WorkbenchView packageExplorer;

	@Test
	public void testing() {

		createJavaProject();
		for (int i = 0; i < 1; i++) {
			createJavaClass("testing" + i, "");
		}
		
		ProblemsView problemsView = new ProblemsView ();
		problemsView .open ();
		new WorkbenchView("Progress").open();
		new WorkbenchView("JUnit").open();
		new WorkbenchView("Package Explorer").open();
		
		
		WorkbenchShell workbenchShell = new WorkbenchShell();
		long start = System.currentTimeMillis();
		for (int i = 0; i < 100; i++) {
			int wert = i;
			workbenchShell.restore();
			Shell shell = workbenchShell.getSWTWidget();
			Display.getDefault().syncExec(new Runnable() {
				@Override
				public void run() {
					shell.setSize(wert, wert);
				}
			});
			
			workbenchShell.maximize();
		}
		long stop = System.currentTimeMillis();
		System.out.println("Duration: " + (stop - start));

	}
	
	private static void createJavaProject() {
		JavaProjectWizard javaProject = new JavaProjectWizard();
		javaProject.open();

		NewJavaProjectWizardPageOne javaWizardPage = new NewJavaProjectWizardPageOne(javaProject);
		javaWizardPage.setProjectName("LARS");

		javaProject.finish();
	}

	private static void createJavaClass(String name, String text) {
		NewClassCreationWizard javaClassDialog = new NewClassCreationWizard();
		javaClassDialog.open();

		NewClassWizardPage wizardPage = new NewClassWizardPage(javaClassDialog);
		wizardPage.setName(name);
		wizardPage.setPackage("test");
		wizardPage.setStaticMainMethod(true);
		javaClassDialog.finish();

		StyledText dst = new DefaultStyledText();
		dst.insertText(7, 0, text);
		new DefaultEditor().save();
	}


}

[vogella]

Eclipse SDK
Version: 2019-03 (4.11)
Build id: I20190127-1800
OS: Linux, v.4.18.0-13-generic, x86_64 / gtk 3.24.1, WebKit 2.22.5
Java version: 11.0.2

[odockal]

I am posting probably right behavior of the snippet, how it goes on fedora 29 with

Red Hat Developer Studio
Version: 12.11.0.AM1
Build id: AM1-v20190123-0556-B3891
OS: Linux, v.4.19.13-300.fc29.x86_64, x86_64 / gtk 3.24.1, WebKit 2.22.5
Java version: 11.0.1