1. try to fix xBounds iterator() to match the behavior of `stride(fro…

…m: _xBounds.min, through: _xBounds.range + _xBounds.min, by: 1)`

this fix issues from 2a1ecb4

2. revert clipValuesToContentEnabled to false by default. but enable it for bar chart test - testPositiveValuesWithCustomAxisMaximum()

3. update tvOS test image for testPositiveValuesWithCustomAxisMaximum. After changing tolerance to 0.001, it fails while the same iOS test pass.
I looked into the image diff, it shows the intersect of bar top edge and axis line at value 50 has diff, but I suppose the image is the same. safe to merge.

Source/Charts/Charts/BarLineChartViewBase.swift

@@ -48,7 +48,7 @@ open class BarLineChartViewBase: ChartViewBase, BarLineScatterCandleBubbleChartD
     @objc open var drawBordersEnabled = false
 
     /// When enabled, the values will be clipped to contentRect, otherwise they can bleed outside the content rect.
-    @objc open var clipValuesToContentEnabled: Bool = true
+    @objc open var clipValuesToContentEnabled: Bool = false
 
     /// When disabled, the data and/or highlights will not be clipped to contentRect. Disabling this option can
     /// be useful, when the data lies fully within the content rect, but is drawn in such a way (such as thick lines)

Source/Charts/Renderers/BarLineScatterCandleBubbleRenderer.swift

@@ -111,9 +111,9 @@ extension BarLineScatterCandleBubbleRenderer.XBounds: Sequence {
         }
 
         public mutating func next() -> Int? {
-            guard value < bounds.max else { return  nil }
+            guard value <= bounds.max else { return  nil }
             value += 1
-            return value
+            return value - 1
         }
     }
 

Tests/Charts/BarChartTests.swift

@@ -109,6 +109,7 @@ class BarChartTests: FBSnapshotTestCase
         let dataSet = setupDefaultDataSet(chartDataEntries: dataEntries)
         let chart = setupDefaultChart(dataSets: [dataSet])
         chart.leftAxis.axisMaximum = 50
+        chart.clipValuesToContentEnabled = true
         chart.notifyDataSetChanged()
         ChartsSnapshotVerifyView(chart, identifier: Snapshot.identifier(UIScreen.main.bounds.size), overallTolerance: Snapshot.tolerance)
     }