Microsoft has officially confirmed that it is working on a fix for a problem that affects WinUI 3 applications when resizing Windows windows. These are visual errors that appear when the user changes the dimensions of the application by dragging: black bars, screen splitting and flickering can be seen along the edges of the window, which seems much rougher than in older UWP applications.
The problem is particularly interesting because the UWP platform is practically abandoned, while WinUI 3 is the framework that Microsoft presents as the modern foundation for Windows applications. However, in this particular situation, older applications, such as the Microsoft Store and Windows Clock, seem noticeably softer, smoother and more stable when resizing the window than the newer WinUI 3 applications.
WinUI 3 applications are waiting for an important Windows update
Microsoft design director March Rogers confirmed on social media that the Windows team is working on improvements to the platform that should remove these visual issues. According to him, the solution is currently being tested on built-in applications, in order to check stability before wider delivery.
Once testing is complete, the fix will be pushed through the Windows App SDK. The plan is to roll out the enhancement gradually this summer, which should provide developers with more stable and visually cleaner behavior for WinUI 3 apps.
This is an important topic for Windows 11 app development, as basic actions like window resizing need to work smoothly and reliably. If the new platform lags behind the old one in such a visible part of the interface, it sends a bad message to developers who need to switch to a more modern Microsoft system.
It is also interesting that Rogers mentions testing on embedded applications. This may indicate that Microsoft is really speeding up the development of native WinUI 3 applications for Windows 11. Earlier reports already mentioned that the company is forming a team that will deal with the creation of original WinUI 3 applications, while some Microsoft engineers said that “native” applications are finally coming back, reports Spidersweb.