Dark mode fixes

[KlausLoeffelmann]

• Fixes Regression - #12663 broke StatusStrip DarkMode coloring. #12909
• Fixes [Dark Mode] TabControl is not in dark mode after enabled SystemColorMode.Dark #11953
• Fixes [Dark Mode] Some rows/columns and ColumnHeader/RowHeader in the DataGridView control have incorrect colors  #11893
• Fixes [Dark Mode] StatusStrip and ToolStrip have incorrect color when RenderMode is set to "System" #11901
• Depending on author availability, either Address non dark-mode coloring of listitem and treenode controls while in edit mode #12674 will be fixing 12042, also this fixes [Dark Mode] The nodes of TreeView not in dark mode when editing it #12042 then also.

Microsoft Reviewers: Open in CodeFlow

[KlausLoeffelmann]

@RussKie: Can you give me an idea how to address the failing Labeler, here? Thanks!

[RussKie]

@RussKie: Can you give me an idea how to address the failing Labeler, here? Thanks!

#13101 (comment)

[xPaw]

I'm curious, would it be possible to target these fixes for a .NET 9 release?

[merriemcgaw]

@xPaw -

I'm curious, would it be possible to target these fixes for a .NET 9 release?

Dark mode was introduced in .NET 9 as an experimental feature to gather feedback so we can make it fully supported in .NET 10. Alas, we do not service experimental features. That said, we'd love your feedback and testing of this feature for .NET 10! There are so many corner cases with Dark Mode, the more testing we get, the better!

[paul1956]

@merriemcgaw would love to see some sample code to address highlight colors in controls that don't support DarkMode yet. Currently StatusStrip which does not support DarkMode returns SystemColor values for ControlText and Control but don't actually use those colors to render.

So testing If DarkMode and inverting the colors the text becomes the control color and disappears.

There needs to be a way to know if a control supports DarkMode independently of "is system in DarkMode". I can work around this today but then my program would break when those controls actually support DarkMode.
When I moved to .Net 9 and enabled DarkMode some of my text just disappeared in code I hadn't changed in years.

[merriemcgaw]

@KlausLoeffelmann may have some answers for you.