[Bug] When changing the Style of the Label at runtime, TextDecorations property setting in Style not working

[syncsiva]

Description

When changing the Style of the Label at runtime, TextDecorations property setting in Style not working.

Steps to Reproduce

Sample
styling-issue.zip

1. Run the below sample.
2. Click the Change Style button.
3. You can see "No Style Applied" text of label gets changed to "Style1 Applied". Also text color changed to red.
4. Now again click the button to apply style2. Now, label text gets changes to "Style2 Applied" and text color changed to green. In addition to that text underlined since TextDecorations set as Underline.
5. Now again click the button to apply styl1. Now label text and color changed. But Underline is no removed which is applied via Style2.

The above one is the basic use case. I have reproduced the issue since we have faced issue with SfListView of Syncfusion. In the same attached sample, Style1 applied for a level inside ListView ItemTemplate if contactname is kyle and style2 applied otherwise. But TextDecoration alone not updated when scrolling the SfListView.
Note: I have tested the same against Xamarin.Forms CollectionView and it worked with Xamarin.Forms CollectionView.

Test in UWP and Android and issue reproduced. Not tested in iOS.

Expected Behavior

When switching between Style1 and Style2, TextDecorations not changed correctly.

<Style x:Key="Style1" Class="Style1" TargetType="Label"> <Setter Property="FontSize" Value="12" /> <Setter Property="HorizontalOptions" Value="FillAndExpand" /> <Setter Property="TextDecorations" Value="None" /> <Setter Property="TextColor" Value="Red" /> </Style>

<Style x:Key="Style2" Class="Style2" TargetType="Label"> <Setter Property="FontSize" Value="16" /> <Setter Property="HorizontalOptions" Value="FillAndExpand" /> <Setter Property="TextDecorations" Value="Underline" /> <Setter Property="TextColor" Value="Green" /> </Style>

Actual Behavior

Basic Information

• Version with issue:
• Last known good version:
• IDE: VS2019
• Platform Target Frameworks:
  • iOS: Xamarin.Mac SDK 12.4.0.64
  • Android: Latest
  • UWP: 16299
• Android Support Library Version:
• Nuget Packages:
• Affected Devices:

Screenshots

Initial Loading

After clicking Change Style Buton, Style 1 applied.

Again after clicking the change style button, style 2 applied.

Again after clicking the change style button, style1 applied. But textdecoration applied from Style 2 is not removed.

Reproduction Link

[syncsiva]

I think the same issue can be reproduced when using DataTrigger also. This issue and the below issue seems related to one another.
#3826

[hartez]

Simpler repro:
_9110 Repro.zip

[syncsiva]

Please confirm whether fixing the below issue will resolve this issue also?
#4121

[jayaleshwari]

Can you please update on this ?

[LakshmiNatarajan21]

Can you please update the timeline for this issue?

[LakshmiNatarajan21]

Could you please update on this?

[JeyasriVijay]

Can you please update the timeline for this issue?

[dconlisk]

I'm seeing a similar issue using sfListView (version 18.1.0.57) with labels on iOS (no problem on Android).

[chrisfoulds]

Still broke on iOS

[Softtinn]

This is still a real, and annoying problem. Any workarounds?! The buttons are also affected by this.....