When the zoom level is configured from 100 to 150, the icons in Eclipse popup menus become blurry.

[real2019]

Summary: Popup menu icons are blurry when display zoom is changed at
runtime from 100% to 150%

Description:

Steps to Reproduce:

1. Start Eclipse with the Windows display zoom set to 100%.
2. Right-click any view (e.g., Project Explorer) to open a popup/context
   menu. The menu item icons are sharp at this step.
3. Change the display zoom to 150%
   (Windows Settings -> System -> Display -> Scale: 150%).
4. Do NOT restart Eclipse; right-click the same view again to open the
   popup menu.
5. Observe that the menu item icons are now blurry.

Expected Behavior:
Popup menu icons remain sharp after a runtime zoom change, with the same
quality as when Eclipse is started directly at that zoom level.

Actual Behavior:
Icons in popup menus are blurry / pixelated after changing the zoom from
100% to 150% at runtime. Toolbar icons and other UI elements remain sharp.

Control tests (all performed on the same machine):

• 100% -> 175% at runtime: NOT blurry.
• Started Eclipse directly at 150%: NOT blurry.
• Started at 100% then changed to 150% at runtime: BLURRY (only this
  combination triggers the issue).

=> The blur is specific to the runtime zoom-change path, not to the 150%
zoom level itself.

zoom level 150 image:

zoom level 175 image:

Environment:

• OS: Windows 11 Pro 23H2 (64-bit)
• Eclipse: 2026-03 (4.39.0)
• JDK: Temurin 21.0.x
• HiDPI mode: Windows per-monitor scaling, display zoom 150%

Additional Notes:
zoom level 150:

[HeikoKlare]

Can you please post the complete configuration of our product, including all VM arguments and the preference value for the monitor-specific UI scaling?
We have experienced such wrong scaling of menu entries in the past and implemented quite some logic to produce properly scaled images and since then have not had any reports of such isues.
The posted screenshots are inconclusive for me for different reasons:

• The 150% image shows an overall much smaller UI than the 175% image, so the overall scaling of the application does not seem to be "correct".
• The menu icons are not smoothly scaled, like it would be done by SWT, so there must be an OS mechanism kicking in.

When I apply the described workflow, I get this (expected) result on 150%:

[real2019]

eclipse.ini params:
-startup
plugins/org.eclipse.equinox.launcher_1.7.100.v20251111-0406.jar
--launcher.library
plugins/org.eclipse.equinox.launcher.win32.win32.x86_64_1.3.0.v20260203-2149
-product
org.eclipse.epp.package.rcp.product
-showsplash
org.eclipse.epp.package.common
--launcher.defaultAction
openFile
--launcher.appendVmargs
-vm
plugins/org.eclipse.justj.openjdk.hotspot.jre.full.win32.x86_64_21.0.10.v20260205-0638/jre/bin
-vmargs
-XX:CompileCommand=quiet
-XX:CompileCommand=exclude org.eclipse.jdt.internal.core.dom.rewrite.ASTRewriteAnalyzer::getExtendedRange
-Dorg.eclipse.ecf.provider.filetransfer.excludeContributors=org.eclipse.ecf.provider.filetransfer.httpclientjava
-Dosgi.requiredJavaVersion=21
-Dosgi.instance.area.default=@user.home/eclipse-workspace
-Dosgi.dataAreaRequiresExplicitInit=true
-Dorg.eclipse.swt.graphics.Resource.reportNonDisposed=true
-Declipse.e4.inject.javax.warning=false
-Dsun.java.command=Eclipse
-Declipse.platform.mergeTrust=true
-XX:+UseG1GC
-XX:+UseStringDeduplication
--add-modules=ALL-SYSTEM
-javaagent:D:\eclipse-new-2026\lombok.jar

preference value for the monitor-specific：

org.eclipse.ui.prefs:
eclipse.preferences.version=1
monitorSpecificScaling=true

Please let me know if any other configuration is needed. If the problem is due to my setup, I would appreciate it if you could point out what is wrong.

[HeikoKlare]

Is your installation an older Eclipse release that you have updated? If yes, have you tried with a completely fresh Eclipse 2026-03 installation?
If I remember correctly, we have replaced the Equinox executable configuration with 2026-03 and maybe that one is not updated properly and produces a wrong DPI awareness. I do currently not see any other differences to other/ordinary setups.

[real2019]

It is indeed an extracted (zip) installation. There is also an older Eclipse version on this machine, installed the same way via extraction — they are in separate directories and I did not update over the old one.

Windows dpi awareness infomation