GTK4: Test_org_eclipse_swt_widgets_Text test failure

[raghucssit]

Test_org_eclipse_swt_widgets_Text has 4 test failures on GTK4.

2025-09-08T15:18:37.6781210Z [ERROR] Tests run: 133, Failures: 4, Errors: 0, Skipped: 0, Time elapsed: 14.50 s <<< FAILURE! -- in org.eclipse.swt.tests.junit.Test_org_eclipse_swt_widgets_Text
2025-09-08T15:18:37.6783213Z [ERROR] org.eclipse.swt.tests.junit.Test_org_eclipse_swt_widgets_Text.test_consistency_Segments -- Time elapsed: 0.452 s <<< FAILURE!
2025-09-08T15:18:37.6785887Z java.lang.AssertionError: expected:<true> but was:<false>
2025-09-08T15:18:37.6786450Z 	at org.junit.Assert.fail(Assert.java:89)
2025-09-08T15:18:37.6786964Z 	at org.junit.Assert.failNotEquals(Assert.java:835)
2025-09-08T15:18:37.6787499Z 	at org.junit.Assert.assertEquals(Assert.java:120)
2025-09-08T15:18:37.6788016Z 	at org.junit.Assert.assertEquals(Assert.java:146)
2025-09-08T15:18:37.6788913Z 	at org.eclipse.swt.tests.junit.Test_org_eclipse_swt_widgets_Text.doSegmentsTest(Test_org_eclipse_swt_widgets_Text.java:1500)
2025-09-08T15:18:37.6790543Z 	at org.eclipse.swt.tests.junit.Test_org_eclipse_swt_widgets_Text.test_consistency_Segments(Test_org_eclipse_swt_widgets_Text.java:1450)
2025-09-08T15:18:37.6791589Z 	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
2025-09-08T15:18:37.6793184Z 	Suppressed: java.lang.Throwable: Screenshot written to /tmp/org.eclipse.swt.tests.junit.Test_org_eclipse_swt_widgets_Text.test_consistency_Segments.png
2025-09-08T15:18:37.6794433Z 		at org.eclipse.test.Screenshots$ScreenshotOnFailure.failed(Screenshots.java:41)
2025-09-08T15:18:37.6794946Z 
2025-09-08T15:18:37.6795484Z [ERROR] org.eclipse.swt.tests.junit.Test_org_eclipse_swt_widgets_Text.test_copy -- Time elapsed: 0.436 s <<< FAILURE!
2025-09-08T15:18:37.6796395Z org.junit.ComparisonFailure: expected:<[00000]> but was:<[]>
2025-09-08T15:18:37.6796957Z 	at org.junit.Assert.assertEquals(Assert.java:117)
2025-09-08T15:18:37.6797475Z 	at org.junit.Assert.assertEquals(Assert.java:146)
2025-09-08T15:18:37.6798310Z 	at org.eclipse.swt.tests.junit.Test_org_eclipse_swt_widgets_Text.test_copy(Test_org_eclipse_swt_widgets_Text.java:291)
2025-09-08T15:18:37.6798879Z 	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
2025-09-08T15:18:37.6799530Z 	Suppressed: java.lang.Throwable: Screenshot written to /tmp/org.eclipse.swt.tests.junit.Test_org_eclipse_swt_widgets_Text.test_copy.png
2025-09-08T15:18:37.6800214Z 		at org.eclipse.test.Screenshots$ScreenshotOnFailure.failed(Screenshots.java:41)
2025-09-08T15:18:37.6800516Z 
2025-09-08T15:18:37.6800914Z [ERROR] org.eclipse.swt.tests.junit.Test_org_eclipse_swt_widgets_Text.test_setFontLorg_eclipse_swt_graphics_Font -- Time elapsed: 0.469 s <<< FAILURE!
2025-09-08T15:18:37.6801472Z java.lang.AssertionError
2025-09-08T15:18:37.6801700Z 	at org.junit.Assert.fail(Assert.java:87)
2025-09-08T15:18:37.6801984Z 	at org.junit.Assert.assertTrue(Assert.java:42)
2025-09-08T15:18:37.6802271Z 	at org.junit.Assert.assertTrue(Assert.java:53)
2025-09-08T15:18:37.6803103Z 	at org.eclipse.swt.tests.junit.Test_org_eclipse_swt_widgets_Text.test_setFontLorg_eclipse_swt_graphics_Font(Test_org_eclipse_swt_widgets_Text.java:1095)
2025-09-08T15:18:37.6803754Z 	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
2025-09-08T15:18:37.6804471Z 	Suppressed: java.lang.Throwable: Screenshot written to /tmp/org.eclipse.swt.tests.junit.Test_org_eclipse_swt_widgets_Text.test_setFontLorg_eclipse_swt_graphics_Font.png
2025-09-08T15:18:37.6805238Z 		at org.eclipse.test.Screenshots$ScreenshotOnFailure.failed(Screenshots.java:41)
2025-09-08T15:18:37.6805527Z 
2025-09-08T15:18:37.6805847Z [ERROR] org.eclipse.swt.tests.junit.Test_org_eclipse_swt_widgets_Text.test_paste -- Time elapsed: 0.510 s <<< FAILURE!
2025-09-08T15:18:37.6806415Z org.junit.ComparisonFailure: expected:<[23]01234567890> but was:<[]01234567890>
2025-09-08T15:18:37.6806811Z 	at org.junit.Assert.assertEquals(Assert.java:117)
2025-09-08T15:18:37.6807120Z 	at org.junit.Assert.assertEquals(Assert.java:146)
2025-09-08T15:18:37.6807609Z 	at org.eclipse.swt.tests.junit.Test_org_eclipse_swt_widgets_Text.test_paste(Test_org_eclipse_swt_widgets_Text.java:940)
2025-09-08T15:18:37.6808149Z 	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
2025-09-08T15:18:37.6808758Z 	Suppressed: java.lang.Throwable: Screenshot written to /tmp/org.eclipse.swt.tests.junit.Test_org_eclipse_swt_widgets_Text.test_paste.png
2025-09-08T15:18:37.6809425Z 		at org.eclipse.test.Screenshots$ScreenshotOnFailure.failed(Screenshots.java:41)

[raghucssit]

I am investigating this.

[raghucssit]

IN GTK3 segment listener is called on copy but on GTK4 it is not ONLY for style SWT.SINGLE.. That is the reason org.eclipse.swt.tests.junit.Test_org_eclipse_swt_widgets_Text.test_consistency_Segments is failing..
This is the simple manual reproducer I have tried..

public class TextSegmentCopyManual {
    public static void main(String[] args) {
        Display display = new Display();
        Shell shell = new Shell(display);
        shell.setText("Segment Listener Copy Test");

        Text text = new Text(shell, SWT.BORDER | SWT.SINGLE);
        text.setBounds(10, 10, 300, 100);
        text.setText("0123456789");

        text.addSegmentListener(new SegmentListener() {
            @Override
            public void getSegments(SegmentEvent event) {
                System.out.println("SegmentListener called! lineText=" + event.lineText);
                event.segments = new int[]{1, event.lineText.length()};
            }
        });

        System.out.println("Calling copy()...");
        text.selectAll();
        text.copy();

        shell.setSize(350, 180);
        shell.open();


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

The difference is GTK calls are different for copy on Text.

if (GTK.GTK4) {
			GTK4.gtk_widget_activate_action(textHandle, OS.action_copy_clipboard, null);
		} else {
			GTK3.gtk_editable_copy_clipboard(handle);
		}

[raghucssit]

paste and font heights works fine manually. However spinning event loop or introducing delay did not help to fix them.

Paste:

test_paste_manual.webm

Font Height:

test_font_height_manual.webm

[raghucssit]

Conclusion about failed Text tests is that.
org.eclipse.swt.tests.junit.Test_org_eclipse_swt_widgets_Text.test_consistency_Segments is a bug in SWT. Needs to be fixed.
Other 3 are async/timing issues. As they all works fine manually.
I have created PR for copy test, which passes on spinning event loop. However paste fails.