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Fix rounding error when getting VisualLine #425

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Fix rounding error when getting VisualLine #425

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6 changes: 4 additions & 2 deletions ICSharpCode.AvalonEdit/Rendering/TextView.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -1743,10 +1743,12 @@ public VisualLine GetVisualLineFromVisualTop(double visualTop)
// TODO: change this method to also work outside the visible range -
// required to make GetPosition work as expected!
EnsureVisualLines();

double epsilon = 1e-12; // Small margin to prevent rounding problems, Double.Epsilon is not a large enough margin.
foreach (VisualLine vl in this.VisualLines) {
if (visualTop < vl.VisualTop)
if (visualTop < vl.VisualTop - epsilon)
continue;
if (visualTop < vl.VisualTop + vl.Height)
if (visualTop < vl.VisualTop + vl.Height - epsilon)
return vl;
}
return null;
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