Bindings to Width and Height of a Control never stop triggering, even if size did not change at all.

[Picao84]

Description

I have a font size converter that takes a label width and height to adjust the font size using native code. Long after the font size has been set the converter keeps being triggered, as if the label width and height was changed, but its the exact same values as before.

This has only started happening from version 8.0.6 onwards on Android (iOS works perfectly fine). On a static screen this may not be noticeable but if you have animations (e.g. panels moving) they are very choppy. It can potentially lead to higher resource usage and low performance.

Steps to Reproduce

1 - Create a XAML page and add a label.

2 - Create an implementation of IMultiValueConverter.

3 - Add a multibinding to label for any property (e.g. Font Size) like this:

<Label.FontSize>
    <MultiBinding Converter="{StaticResource FontSizeConverter}">
         <Binding Source="{RelativeSource Self}" Path="Text"/>
         <Binding Source="{RelativeSource Self}" Path="Width"/>
         <Binding Source="{RelativeSource Self}" Path="Height"/>
    </MultiBinding>
</Label.FontSize>

4 - Put a breakpoint on on the IMultiValueConverter implementation Convert method and see it being triggered all the time.

Link to public reproduction project repository

No response

Version with bug

8.0.7 SR2

Is this a regression from previous behavior?

Yes, this used to work in .NET MAUI

Last version that worked well

8.0.6 SR1

Affected platforms

Android

Affected platform versions

Android 13 and Android 14

Did you find any workaround?

Unfortunately not.

Relevant log output

No response

[github-actions]

Hi I'm an AI powered bot that finds similar issues based off the issue title.

Please view the issues below to see if they solve your problem, and if the issue describes your problem please consider closing this one and thumbs upping the other issue to help us prioritize it. Thank you!

Open similar issues:

• The issue with the MultiBinding converter does not work properly when changing the values. (#20382), similarity score: 0.73
• Binding an Item's height and width to another item's height and Width in XAML causes exceptions and unexpected behaviors (#6200), similarity score: 0.73
• Binding to HeightRequest not working properly (#16435), similarity score: 0.72

Closed similar issues:

• Converters/DataTrigger/MultiTrigger not updating the destination property (#15455), similarity score: 0.73
• [regression/8.0.0-preview.7.8842] Binding Issue: Multiple platform Label control - Multiple properties (#16722), similarity score: 0.72

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[PureWeen]

Possibly related
#22347

[Picao84]

It does sound a lot like what I'm seeing yes!

[PureWeen]

Can you test with the latest nightly build?
https://github.com/dotnet/maui/wiki/Nightly-Builds

[Picao84]

The latest nightly build seems to have fixed this issue. Unfortunately it created other issues like custom fonts not working at all and border corner radius not working when set from code... sigh.

[PureWeen]

The latest nightly build seems to have fixed this issue. Unfortunately it created other issues like custom fonts not working at all and border corner radius not working when set from code... sigh.

Can you please log issues for these so we can fix ASAP?

The border issue might be fixed by
#22558