Clicking behavior when indentation is present differs between Eclipse 4.36 and 4.37

[xinyi-gong]

Hi everyone,

I'm a developer working on Copilot for Eclipse plugin. I am currently working on a feature that needs to extend the textViewer to show some next edit suggestions. As part of a feature I’m developing, I need to set a custom line indentation on a specific line within a TextViewer.

In Eclipse 4.36 and earlier, this worked as expected. When I added indentation, clicking inside the indentation area or nearby lines did not cause the indentation to disappear/fickers.

However, starting from Eclipse 4.37, I’ve observed a different behavior:

• When I click the indentation area, the indentation flickers.
• Clicking nearby lines can cause the indentation to disappear

I’m trying to understand why this behavior changed.
Was this an intentional design update — for example, to allow the editor to automatically respond to user clicks and clear indentation, or could it be an unintended side effect of recent UI changes in the text framework?

Any insights into what might be causing this difference in behavior between 4.36 and 4.37 would be greatly appreciated.

Thanks!

[iloveeclipse]

Please provide either a test, screenshot or video showing the problem.
Also please test with latest 4.38 nightly build from https://download.eclipse.org/eclipse/downloads/drops4/I20251028-1800.
It could be a new feature added that breaks something or just a bug.

[xinyi-gong]

I realized that the IDE I was using was Eclipse 2025-09 M2. I tested the official Eclipse 2025-09 release, and the issue no longer occurs.
Sorry for the confusion and inconvenience. Closing this discussion.