Removed unused code.

src/Perspex.Controls/Presenters/TextPresenter.cs

@@ -2,7 +2,6 @@
 // Licensed under the MIT license. See licence.md file in the project root for full license information.
 
 using System;
-using System.Linq;
 using System.Reactive.Linq;
 using Perspex.Media;
 using Perspex.Styling;
@@ -24,7 +23,6 @@ namespace Perspex.Controls.Presenters
 
         private readonly DispatcherTimer _caretTimer;
         private bool _caretBlink;
-        private IObservable<bool> _canScrollHorizontally;
         private Brush _highlightBrush;
 
         static TextPresenter()
@@ -38,9 +36,6 @@ namespace Perspex.Controls.Presenters
             _caretTimer.Interval = TimeSpan.FromMilliseconds(500);
             _caretTimer.Tick += CaretTimerTick;
 
-            _canScrollHorizontally = this.GetObservable(TextWrappingProperty)
-                .Select(x => x == TextWrapping.NoWrap);
-
             Observable.Merge(
                 this.GetObservable(SelectionStartProperty),
                 this.GetObservable(SelectionEndProperty))