[chronojump] Fixed a line sometimes appearing after paintAxisAndGrid() cairo graphs

[Xavier de Blas <xaviblas src gnome org>]

commit 2fe120ebb42c2b63035a6c124e18774a552abe12
Author: Xavier de Blas <xaviblas gmail com>
Date:   Thu Aug 6 17:17:00 2020 +0200

    Fixed a line sometimes appearing after paintAxisAndGrid() cairo graphs

 src/gui/cairo/xy.cs | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/gui/cairo/xy.cs b/src/gui/cairo/xy.cs
index 74d44dd1..c4a5232c 100644
--- a/src/gui/cairo/xy.cs
+++ b/src/gui/cairo/xy.cs
@@ -274,6 +274,7 @@ public abstract class CairoXY
                printText(2, Convert.ToInt32(outerMargins/2), 0, textHeight, getYAxisLabel(), g, false);
                printText(graphWidth - Convert.ToInt32(outerMargins/2), graphHeight - outerMargins, 0, 
textHeight, getXAxisLabel(), g, false);
 
+               g.Stroke ();
                g.LineWidth = 2;
        }