System font scaling not working on the fly

[kirsan31]

• .NET Core Version: 3.0+

• Have you experienced this same bug with .NET Framework?: Yes, but strictly not applicable because .NET Framework dose'nt respect system font.

Problem description:
With AutoScaleMode.Font WinForms app must respect system font changes on the fly. But this doesn't happens - some controls will increase their font, some will not, but all of them not will increase their sizes. Correct look will be only after restart the app.

I think this is well known problem, but have created this for tracking...

Expected behavior:
App must correctly scale after system font changed, without relaunch.

Minimal repro:
Any WinForms app with AutoScaleMode.Font.

[kirsan31]

@merriemcgaw will this issue be considered during DPI scaling system overhaul, or may be earlier? For us Font scaling is more important than DPI scaling, because font change can be easily apply during RDP connection, unlike DPI change...
Thanks.

[RussKie]

Font scaling is not going away. We plan to review, refactor and modernise the layout engine, and this involves both Font and DPI scaling. Unfortunately .NET 5.0 is almost at the end of its runway, so this will be done in NET 6.0 timeframe.

[merriemcgaw]

Thanks for the heads up on the scenario @kirsan31 - we will certainly keep this in mind as we work through the design of the layout engine work we want to do in .NET 6. DPI is very high on our list of priorities.