DevStyle plugin has DPI scaling issues in Eclipse 2025-12

[jxb532]

Using

• Eclipse IDE for Java Developers 2025-12 (4.38.0), Build ID 20251204-0850, Windows x86_64
• DevStyle plugin version 2025.2.0.202509301431
• Windows 11 Pro 25H2 build 26200.7705 (x64)
• Laptop with a display resolution of 3840x2160, with 200% scaling set at the system level
• External monitor with a display resolution of 2560x1440, with no scaling

Issue

With Eclipse on the second, unscaled monitor, certain UI elements (e.g., in the Package Explorer and Outline tab) are scaled to 200%. Other elements (e.g., toolbar, editor) are correctly unscaled:

With Eclipse on the scaled monitor, some things aren't scaled, and are too small:

Steps to Reproduce

• Install a fresh copy of Eclipse IDE for Java Developers 2025-12 .
• Install the DevStyle plugin 2025.2.0.202509301431 from the Eclipse Marketplace (I unchecked the "Code Together" bundle, but I don't think this makes a difference).
• Create a new Java project so there's an entry listed in the Package Explorer tab.
• Create a new Java class within that project so there's an entry listed in the Outline tab.
• Drag the Eclipse window between the monitor with display scaling enabled and the unscaled monitor.
• When the Eclipse window is on the unscaled monitor, see that the items in the Package Explorer and Outline tabs do not adjust their scaling for the second monitor. They're still scaled at 200% despite the rest of the UI adjusting properly.

Other notes

• I've also reproduced this in Eclipse 2025-09 and 2025-06. The issue does NOT happen in 2025-03 and earlier.
• This issue does not happen until you install the DevStyle plugin. It does not seem to be an issue with the base version of Eclipse.
  • That being said, there does seem to be a difference between Eclipse versions even without DevStyle. The affected versions take a few seconds to redraw the UI elements at the new scale when you drag it between monitors. The older Eclipse verions redraw the UI at the new scale almost instantly. So Eclipse does seem to be handling this differently between versions.
• Relaunching Eclipse so that it starts on the second, unscaled monitor will still cause this issue (even when the Eclipse window was never on the primary, scaled monitor).
  • Certain tabs exhibit different behavior. For example, Package Explorer and Outline seem to always scale to 200%, regardless of which monitor the Eclipse window launched on. Others, like Declaration and Problems, keep the scaling from the monitor that Eclipse was launched on and never adjust when the window is dragged to the other monitor.
• In Eclipse > Window > Preferences > DevStyle, unchecking "Use enhanced DevStyle Themes" does NOT fix the issue. You can only resolve it by uninstalling the DevStyle plugin. Simply disabling the enhanced DevStyle themes does nothing. As long as DevStyle is installed, the scaling issue still happens. Here's a screenshot with DevStyle installed, but with the DevStyle theme disabled:

[brianvfernandes]

In 2025-06, Eclipse added support for monitor specific UI scaling - this is why you see a difference. Can you check what setting you have at Preferences > General > Appearance for "Use monitor-specific UI scaling"? What if you toggle this and restart Eclipse, any difference?

Additionally, please note that DevStyle is now developed and maintained by CodeTogether - please write to support@codetogether.com for quicker assistance, if the above does not help. Thanks!

[jxb532]

Ah, that was the issue! The monitor specific UI scaling option was enabled, and unchecking it made Eclipse behave like I would expect. Thank you! I'll reach out to CodeTogether to see if they are aware that DevStyle is incompatible with the monitor specific scaling option.

[brianvfernandes]

I'm glad that fixed the problem, thanks for confirming. Ideally, DevStyle should work with that setting on - I'll let the CodeTogether team know as well.