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Hello!
When we set ExtendsContentIntoTitleBar to true in the application on Dark Mode, we have strange top line when we click to maximize window. This behavior occurs when the screen/monitor have Resolution 100%, 125% etc. I opened a issue in Microsoft's GitHub but we don't have solution yet.
Platform: WinUI 3 - Windows App SDK 1.4.3: 1.4.231115000
GitHub issue: https://github.com/microsoft/microsoft-ui-xaml/issues/9176
Steps to reproduce the bug
Is there some solution or workaround to solve this case?
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(316.8, 40%, 40%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EYL%3C/text%3E%3C/svg%3E)
Is your program MAUI or WinUI3?
I tested it on Windows 11 with a WinUI3 program using your repro steps and this issue did not appear.
In addition, Q&A is not a bug reporting or tracking system. If you think you've found a bug in Maui, please keep track of the issues you post on GitHub.
Hello @Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) ! Thank you for this interaction.
I mean WinUI3. I registered this issue in https://github.com/microsoft/microsoft-ui-xaml/issues/9176
Best Regards.
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I could reproduce this behavior on my side following your steps. After changing the resolution, there will be a border showing when maximize the app. Currently, here is no solution for this. I noticed that you've submitted an issue in the GitHub. It is appreciated to reporting this issue in the WinUI GitHub. That's the right place for reporting such issue that looks like a bug. Please follow the GitHub issue and waiting for PG's response.