Use the same process for highlighting in LineChartRenderer that was…

… used in `ScatterChartRenderer`.

Fixes ChartsOrg#1495.  I'm not sure if iterating over entries is necessary, or if this can be collapsed to
just a single `set.entryForXValue()` call.

Source/Charts/Renderers/LineChartRenderer.swift

@@ -708,44 +708,47 @@ open class LineChartRenderer: LineRadarRenderer
 
         for high in indices
         {
-            guard let set = lineData.getDataSetByIndex(high.dataSetIndex) as? ILineChartDataSet
-                , set.isHighlightEnabled
+            guard
+                let set = lineData.getDataSetByIndex(high.dataSetIndex) as? ILineChartDataSet,
+                set.isHighlightEnabled
                 else { continue }
-
-            guard let e = set.entryForXValue(high.x) else { continue }
-
-            if !isInBoundsX(entry: e, dataSet: set)
-            {
-                continue
-            }
-
-            context.setStrokeColor(set.highlightColor.cgColor)
-            context.setLineWidth(set.highlightLineWidth)
-            if set.highlightLineDashLengths != nil
-            {
-                context.setLineDash(phase: set.highlightLineDashPhase, lengths: set.highlightLineDashLengths!)
-            }
-            else
-            {
-                context.setLineDash(phase: 0.0, lengths: [])
-            }
-
-            let x = high.x // get the x-position
-            let y = high.y * Double(animator.phaseY)
-
-            if x > chartXMax * animator.phaseX
+
+            let entries = set.entriesForXValue(high.x)
+
+            for entry in entries
             {
-                continue
+                if entry.y != high.y { continue }
+
+                if !isInBoundsX(entry: entry, dataSet: set) { continue }
+
+                context.setStrokeColor(set.highlightColor.cgColor)
+                context.setLineWidth(set.highlightLineWidth)
+                if set.highlightLineDashLengths != nil
+                {
+                    context.setLineDash(phase: set.highlightLineDashPhase, lengths: set.highlightLineDashLengths!)
+                }
+                else
+                {
+                    context.setLineDash(phase: 0.0, lengths: [])
+                }
+
+                let x = entry.x // get the x-position
+                let y = entry.y * Double(animator.phaseY)
+
+                if x > chartXMax * animator.phaseX
+                {
+                    continue
+                }
+
+                let trans = dataProvider.getTransformer(forAxis: set.axisDependency)
+
+                let pt = trans.pixelForValues(x: x, y: y)
+
+                high.setDraw(pt: pt)
+
+                // draw the lines
+                drawHighlightLines(context: context, point: pt, set: set)
             }
-
-            let trans = dataProvider.getTransformer(forAxis: set.axisDependency)
-
-            let pt = trans.pixelForValues(x: x, y: y)
-
-            high.setDraw(pt: pt)
-
-            // draw the lines
-            drawHighlightLines(context: context, point: pt, set: set)
         }
 
         context.restoreGState()