Text sometimes partially disappears in Label when using autoscaling

[selundqma]

We set a text in an org.eclipse.swt.widgets.Label and it is showed nicely when creating an RCP application using Eclipse 2024-12 in all scaling variants. But, in newer versions (2025-03, 2025-06 M1, 2025-06 M2) some of text disappears, "wreco.", when using different scaling in Windows. Like, on my laptop it works fine in 125% scaling. Moving over to 150% and some of the text is missing in the Label. By removing the autoscaling or changing to an older Eclipse version, the text appears also in the 150% case. So... there might be an issue with how sizes are calculated when using autoscaling in higher scaling >= 150%.

OS: Windows 11
Java: JDK 21.0.6.7.1
Issue seen from: Eclipse 2025-03
Issue not seen in: Eclipse 2024-12

Scaling parameters used

-Dswt.autoScale=quarter
-Dswt.autoScale.method=smooth

Eclipse 2024-12 (autoscaling + 150% OS scaling)

Eclipse 2025-06 M2 (autoscaling + 150% OS scaling)

By setting different window sizes in Application.e4xmi, one can see that the text either fits on one line or it wraps correctly.... OR! The last part of the text, "wreco.", disappears.

A test RCP application has been attached. The screenshots were taken from this app.

LabelTest.zip

[fedejeanne]

cc @akoch-yatta