InputScopeAttribute leaks on TextBox in WPF.

_This issue has been moved from [a ticket on Developer Community](https://developercommunity.visualstudio.com/t/InputScopeAttribute-leaks-on-TextBox-in-/10365684)._

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Version: .NET 4.5 (may be later)

I repeatedly enter and delete characters in a WPF TextBox.
It leaks a little memory.

I checked with CLRProfiler45.
The leaking object is InputScopeAttribute.
I close the window, but the InputScopeAttribute object count does not decrease.

I found the cause on referencesource.
TextStore is not decrementing the reference count of InputScopeAttribute.

[https://referencesource.microsoft.com/#PresentationFramework/src/Framework/System/Windows/Documents/TextStore.cs,2698](https://referencesource.microsoft.com/#PresentationFramework/src/Framework/System/Windows/Documents/TextStore.cs,2698)

```
2700 attrval.val.data1.Value = Marshal.GetIUnknownForObject(obj);
2784 _preparedattributes.Add(attrval);

```

The TextStore gets the reference count of the InputScopeAttribute with Marshal.GetIUnknownForObject.

```
785 _preparedattributes.Clear();
2666 _preparedattributes.Clear();

```

But it’s not releasing the reference count with Marshal.Release.

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### Original Comments

#### Feedback Bot on 5/17/2023, 02:09 PM:

(private comment, text removed)
#### Feedback Bot on 9/5/2023, 10:54 AM:

(private comment, text removed)

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### Original Solutions
(no solutions)