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[GTK4] Slow and choppy text scrolling with SWT_GTK4=1

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#3,583 0 comentarios 0 reacciones 0 asignados Ver en GitHub

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Evaluación

Dificultad
4/5
Tiempo estimado
3-5 días
Aptitud para principiantes
48/100
Tipo de issue
Error
Claridad
Bastante claro
Estado de actividad
Activo
Stack tecnológico
java
Área
frontend

Línea de trabajo

The report identifies GTK4-enabled SWT text scrolling in the Eclipse IDE, but names no source file or test. Start by locating the GTK4 text-widget scrolling and input-handling paths, then compare their behavior with GTK3 and look for existing performance tests. Done means holding the down arrow in a large Java file scrolls smoothly and at least as quickly with SWT_GTK4=1 as with GTK3.

Escrito por el modelo de indexación a partir del texto del issue.

Descripción

Describe the bug

I just updated one of my Eclipse installations to 2026-09 and wanted to try the new GTK4 support. Unfortunately, it feels much slower in general, and in particular for text scrolling.

To Reproduce

  1. Start Eclipse 2026-09.
  2. Open some "large" (muliple pages) Java file.
  3. Put the text cursor at the beginning of the file.
  4. Press "down arrow" and keep it pressed.

I'm not sure how much it is visible on video, but here are two captures of this scenario, on the exact same Eclipse and workspace, the only difference being export SWT_GTK4=1 on the second one.

With Gtk3:

https://github.com/user-attachments/assets/610e1676-a34b-4439-8301-668c60b6e51e

With SWT_GTK4=1:

https://github.com/user-attachments/assets/d5f6aa73-e7a9-43bd-9ad9-bd1fdab77ca1

Expected behavior

Scroll behavior should be (at least) as smooth and fast as before.

Environment:

  1. Select the platform(s) on which the behavior is seen:
    • Windows
    • Linux (Fedora Linux 44 (Workstation Edition),
    • macOS
  1. Additional OS info (e.g. OS version, Linux Desktop, etc)

  2. JRE/JDK version

Temurin-25.0.4.1+1 (built-in JustJ)

Version since

Eclipse IDE for Eclipse Committers (includes Incubating components)
Version: 2026-09 (4.41.0)
Build id: 20260903-0720

Workaround (or) Additional context
Add any other context about the problem here.
Any known workarounds for the problem?

Lenguaje dominante
Java
Estrellas
202
Forks
206
Merge medio
16 h 56 min
PR fusionados (30 d)
110

Preparar el entorno

Primeros pasos

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  3. Haz un fork del repositorio y trabaja en una rama.
  4. Abre un pull request que haga referencia al número del issue.

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