Why ObservableObject.PropertyChanging is not available since .NET 4.5?

[marbel82]

Projects since .NET4.5 are compiled with PORTABLE define, which causes PropertyChanging property to be skipped during compilation.

Project GalaSoft.MvvmLight.Platform (NET45).csproj only include project GalaSoft.MvvmLight %28PCL%29.csproj and doesn't change its define constants

mvvmlight/GalaSoft.MvvmLight/GalaSoft.MvvmLight.Platform (NET45)/GalaSoft.MvvmLight.Platform (NET45).csproj

Lines 70 to 73 in 4cbf77c

	<ProjectReference Include="..\GalaSoft.MvvmLight %28PCL%29\GalaSoft.MvvmLight %28PCL%29.csproj">
	<Project>{6a912701-3ba1-4975-adbf-160caf66b640}</Project>
	<Name>GalaSoft.MvvmLight %28PCL%29</Name>
	</ProjectReference>

mvvmlight/GalaSoft.MvvmLight/GalaSoft.MvvmLight (PCL)/ObservableObject.cs

Lines 56 to 72 in 4cbf77c

	#if !PORTABLE && !SL4
	/// <summary>
	/// Occurs before a property value changes.
	/// </summary>
	public event PropertyChangingEventHandler PropertyChanging;
	/// <summary>
	/// Provides access to the PropertyChanging event handler to derived classes.
	/// </summary>
	protected PropertyChangingEventHandler PropertyChangingHandler
	{
	get
	{
	return PropertyChanging;
	}
	}
	#endif