FontImage markup extension doesn't allow AppThemeBinding

[davidortinau]

Description

This works in Hot Reload, but won't compile.

<Button Text="Comment" 
                            Background="Transparent" 
                            TextColor="{AppThemeBinding Light=Black, Dark=White}" 
                            ImageSource="{FontImage Glyph={x:Static f:FontAwesome.CommentAlt}, Color={AppThemeBinding Light=Black, Dark=White}, FontFamily=FontAwesome, Size=18}" />

This works everywhere:

<Button Text="Comment" 
                            Background="Transparent" 
                            TextColor="{AppThemeBinding Light=Black, Dark=White}" >
                            <Button.ImageSource>
                                <FontImageSource Glyph="{x:Static f:FontAwesome.CommentAlt}" 
                                    Color="{AppThemeBinding Light=Black, Dark=White}" 
                                    FontFamily="FontAwesome" 
                                    Size="18" />
                            </Button.ImageSource>
                        </Button>

Steps to Reproduce

No response

Link to public reproduction project repository

No response

Version with bug

8.0.61 SR6.1

Is this a regression from previous behavior?

Not sure, did not test other versions

Last version that worked well

Unknown/Other

Affected platforms

iOS

Affected platform versions

No response

Did you find any workaround?

No response

Relevant log output

No response

[github-actions]

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• AppThemeBinding usage with BindableProperty (#15573), similarity score: 0.74
• ToolbarItem font icon color not updating with AppThemeBinding (#23201), similarity score: 0.71

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[StephaneDelcroix]

I think this was discussed in the past already, but it looks like the FontImageExtension could be removed, and you could use the FontImageSource element with a markup syntax

[StephaneDelcroix]

as a workaround, using {FontImageSource} works. Once #23657 is merged, it also becomes the recommended way, as {fontImage will be deprecated}

[davidortinau]

@mgoertz-msft @DianaSoltani can we get a code analyzer fix for this and work it into Upgrade Assistant?

[mgoertz-msft]

I would start by marking [Obsolete(...)] with a message of what to use instead. All these one-off analyzers/codefixers aren't cheap since we do not have a good infrastructure for manipulating XAML. We can add that to the score card. :)