[chronojump] Fixed a display bug on: paintGridInt VERTICALLINES

[Xavier de Blas <xaviblas src gnome org>]

commit 4bf2850550de739d546a6bcbbb8d34b501651ae7
Author: Xavier de Blas <xaviblas gmail com>
Date:   Wed Feb 2 16:32:04 2022 +0100

    Fixed a display bug on: paintGridInt VERTICALLINES

 src/gui/cairo/generic.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/gui/cairo/generic.cs b/src/gui/cairo/generic.cs
index 6a0fe9c52..ed64d5223 100644
--- a/src/gui/cairo/generic.cs
+++ b/src/gui/cairo/generic.cs
@@ -140,7 +140,7 @@ public abstract class CairoGeneric
                        }
 
                if(gridType != gridTypes.VERTICALLINES)
-                       for(double i = Math.Floor(minX); i <= Math.Ceiling(maxY) ; i += by)
+                       for(double i = Math.Floor(minY); i <= Math.Ceiling(maxY) ; i += by)
                        {
                                int ytemp = Convert.ToInt32(calculatePaintY(i));
                                if(ytemp <= topMargin || ytemp >= graphHeight -bottomMargin)