[Win32] Wrong icons in view toolbars in multi-monitor-zoom setups (sporadic)

[HeikoKlare]

Describe the bug

When using multi-monitor setups with the different monitors having different zooms, it sporadically happens that view toolbars show unexpected icons.

Here are two example:

Sometimes you can also see that just when hovering the shown images are different.

To Reproduce

The behavior is not easy reproduce in a deterministic way, but I see it happen with the following flow very often.

Preparation:

• Set up the system to have a 100% primary monitor and 125/150% (other zooms not tested yet) secondary monitor
• Prepare a (runtime) Eclipse instance:
  • shared area contains a Java editor and a Manifest editor, the Java editor being the active one
  • one view stack contains the outline
  • place the application window on the primary monitor

So you start with something like this:

Workflow

Then do the following:

1. Restart the runtime Eclipse instance
2. Move the window to the secondary monitor
3. Switch to the Manifest editor (the Outline view and its toolbar items change)
4. Move the window back to the primary monitor
5. Switch back to the Java editor
6. Move the window to the secondary monitor again

You end up with this (see the wrong icons in the outline view toolbar):

Expected behavior

Proper toolbar icons to be shown independent from the zoom setup.

Environment

1. Select the platform(s) on which the behavior is seen:

• • All OS
• • Windows
• • Linux
• • macOS

2. Additional OS info (e.g. OS version, Linux Desktop, etc)
   Windows 11 22631

3. JRE/JDK version
   Temurin 25.02.2.10

Version since
Probably since 2026-03 caused by this PR:

• [Win32] Make ImageList retrieval from Display consider zoom #3001

Workaround (or) Additional context
As a workaround, one can enforce a refresh of the view toolbar by changing to another view in the part stack or by switching to another editor that leads to a different view toolbar (in case of the outline view).

I have found this issue together with a potential solution when working on another issue and will provide a PR that should fix the issue (mostly by reverting the mentioned PR) soon.

[HeikoKlare]

When waking up from suspend this morning, I faced this behavior which may also be related:

[merks]

Yes, I've seen all these things, including the strange overlay scaling.