Monitor-spanning windows: command palette has the wrong size when rescale at runtime is active

[fedejeanne]

Finding from test session

Setup

• Primary monitor on the left, 100% zoom
• Secondary monitor on the right, 175% zoom
• -Dswt.autoScale.updateOnRuntime=true

How to reproduce

IMPORTANT: it does NOT suffice to activate rescaling at runtime via the preference. I had to activate it via start parameter in order to reproduce this error.

• Window stretching over both monitors, 51% on the left (100%) monitor
• Open "Command palette" with Ctrl+3 --> The palette opens on the right monitor and it is full-screen

[HeikoKlare]

Might be related to:

• Tackle limitation of point coordinate system #125

[fedejeanne]

@HeikoKlare since this bug is only reproducible by using the VM parameter and eclipse-platform/eclipse.platform.ui#2689 states that the preference should be preferred then I'd say this bug has low priority. WDYT?

[HeikoKlare]

I was not able to achieve the exact same appearance, but when I started with the scenario in the original post, moved the workbench window to the secondary 175% monitor and repeatedly opened the command palette, it always opened on the primary monitor and became smaller every time I opened it:

After eclipse-platform/eclipse.platform.swt#1711, I am not able to produce any issues with the command palette anymore. It always opens in the proper size on the monitor the workbench window is currently placed on.

Can you please check again @fedejeanne and see whether you can still reproduce the issue and otherwise close it?

[fedejeanne]

Reproducible in yesterday's I-BUILD I20250120-1800

IIRC the trick was to go as close to the monitor on the right (175%) without "crossing over" i.e. the Workbench window should stay in 100% zoom.

[HeikoKlare]

Okay, so if I understand correctly, this is a very corner case when the windows spans multiple monitors, right?
Then I propose to set priority to "unconsidered" and prefix the issue title with "Monitor-spanning windows" like the other tickets for issues that only occur when a windows spans multiple monitors, like:

• Monitor-spanning windows: unexpected size of OS pop-ups (context menus, tooltips) #180