wxMessageDialog doesn't handle DPI change under wxMSW dark mode (Issue #26956)

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Aug 31, 2026, 1:59:26 PM (22 hours ago) Aug 31

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PBfordev created an issue (wxWidgets/wxWidgets#26956)

Whe moving a wxMessageDialog under wxMSW dark mode with a long extended message from a screen with high DPI (125% in my case) to regular DPI, the extended message is doubled. The properly sized text is displayed in black, overlaid with large white text:
Image: Image (view on web)

How to reproduce:

Launch the dialogs sample in dark mode on a screen with high DPI.
Press Ctrl+Shift+M and paste into extended message box several (10+) lines of text, for example:

Five paragraphs of Lore ipsum Lorem ipsum dolor sit amet consectetur adipiscing elit. Quisque faucibus ex sapien vitae pellentesque sem placerat. In id cursus mi pretium tellus duis convallis. Tempus leo eu aenean sed diam urna tempor. Pulvinar vivamus fringilla lacus nec metus bibendum egestas. Iaculis massa nisl malesuada lacinia integer nunc posuere. Ut hendrerit semper vel class aptent taciti sociosqu. Ad litora torquent per conubia nostra inceptos himenaeos.

Lorem ipsum dolor sit amet consectetur adipiscing elit. Quisque faucibus ex sapien vitae pellentesque sem placerat. In id cursus mi pretium tellus duis convallis. Tempus leo eu aenean sed diam urna tempor. Pulvinar vivamus fringilla lacus nec metus bibendum egestas. Iaculis massa nisl malesuada lacinia integer nunc posuere. Ut hendrerit semper vel class aptent taciti sociosqu. Ad litora torquent per conubia nostra inceptos himenaeos.

Press Apply and move the dialog to a screen with lower DPI.