[Win32] Wrong text extent calculation with swt.autoScale=int200

[HeikoKlare]

Describe the bug
When running an Eclipse product without monitor-specific scaling (e.g., by disabling the preference or with -Dswt.autoScale.updateOnRuntime=false) and default auto-scale settings (i.e., the implicit swt.autoScale=quarter), wrong font sizes are considered at some places. This particularly includes the header size calculation of CTabFolders, which may become too large/small.
This also happens when running any pure SWT application with default auto-scale settings, such as the CustomControlExample.

It is a regression from:

• Use font zoom in stringExtent and textExtent #2306

To Reproduce

• Set primary monitor zoom to something different than 100% or 200% (e.g., 150%).
• Start the CustomControlExample with default settings and go to the CTabFolder tab or start an Eclipse SDK.
• You will see that tab headers are too small.

Expected behavior
CTabFolder headers shall be sized correct.

Screenshots

Environment:

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

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

Version since
I20250714-1800