Windows 200% scale FontDialog list texts too big

[Phillipus]

• Eclipse 4.38
• Windows 11
• Display set to 200% scaling

When opening a FontDialog the text in the "Font" and "Font Style" lists is bigger than it should be.

(This is not #2866 but a continuation of that.)

Run the Snippet with the property set to true and false.

import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.FontData;
import org.eclipse.swt.widgets.FontDialog;
import org.eclipse.swt.widgets.Shell;

public class FontDialogWindowsDoubled {
    
    public static void main(String[] args) {
        System.setProperty("swt.autoScale.updateOnRuntime", "true");
        
        Shell shell = new Shell();
        
        FontData fd = new FontData("Arial", 9, SWT.NORMAL);
        FontDialog dialog = new FontDialog(shell);
        dialog.setFontList(new FontData[] { fd });
        dialog.open();
    }
}

The text in the dialog's lists is bigger than it should be.

This is how it should be if set to false:

This is how it is if set to true:

[HeikoKlare]

This sound like a very similar (if not even the same) issue than:

• [Win32] Wrong font size is selected when opening FontDialog (monitor-specific scaling) #2866

That one was recently fixed by:

• Ensure Consistent DPI Awareness in getDPI() for Font Calculation #2884

@Phillipus can you check whether it's the same issue, e.g., by testing with a current I-Build if the issue persists?

[Phillipus]

@HeikoKlare:

(This is not #2866 but a continuation of that.)

That is fixed. But the font lists are bigger.

[HeikoKlare]

Oh, I totally missed that. Sorry for that.

[Phillipus]

Oh, I totally missed that. Sorry for that.

I can understand that, this issue did start as a dupllicate of #2866 until I used the latest build and found it has been fixed. But there is now this anomaly in list sizes.

[HeikoKlare]

The reason seems to be that with monitor-specific scaling enabled, those OS dialogs (font selection, color selection and the like) are scaled with a different mechanism (enhanced GDI scaling), whereas without monitor-specific scaling the application's scaling mode (usually System or maybe PerMonitorV2) is used. We chose that approach as there is no other good way to scale to OS dialogs.
Since fonts do not scaled linearly, you see the effect that on a 200% primary screen with, e.g., scaling mode "System" the fonts are a bit smaller (or maybe also the list showing the fonts and styles is a bit larger). With enhanced GDI scaling, as used by monitor-specific scaling, you see linearly scaled fonts, so that the experience on 100% and 200% should be the same. So one could actually say that the behavior is now even more consistent now.

Here are some screenshots for comparison (I currently have not 200% monitor, but the effect seems to be the same).

100%

175% with monitor-specific scaling enabled (i.e., enhanced GDI scaling used)

175% with monitor-specific scaling disabled (same with System and PerMonitorV2 scaling)

What you can also see is that the GDI-scaled dialog is a bit less sharp, which was the compromise taken to allow scaling of those OS dialogs at all.

[Phillipus]

so that the experience on 100% and 200% should be the same. So one could actually say that the behavior is now even more consistent now.

Yes, I also see that with the ColorDialog.

The FontDialog screenshot I posted above with monitor-specific scaling enabled is the same as if the display was set to 100%.

I think I prefer the way the dialogs look at 200% the old way (monitor-specific scaling disabled) but I guess this is the compromise for monitor-specific scaling.

[Phillipus]

@HeikoKlare Shall I close this one?