We've increased the horizontal virtualization cache and it should automatically handle most of the cases. Yet with very long strings, it may be necessary to disable the virtualization by setting the new RadSyntaxEditor.ShouldTaggersProcessEntireLines property to true. By default the property is set to false.

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Hi,

The issue is caused by the insufficient horizontal cache.

Workaround: Increase the HorizontalVirtualizationStep

typeof(LineBasedUILayer<ClassificationTag>).GetField("HorizontalVirtualizationStep", BindingFlags.Static | BindingFlags.NonPublic).SetValue(null, 200);

Result:

Setting a very big step may affect the performance and even with such a step the coloring may fail in certain cases when you have extremely long strings.

Regards,
Hristo
Progress Telerik