Some combinations of font size and outlineWidth lead to issues with TextSymbol. The issue is reproducible in ArcGIS Runtime for Qt 10.2.6.
Last Published: July 29, 2016ArcGIS Runtime SDK for Qt
Bug ID Number
December 8, 2015
December 18, 2020
ArcGIS Runtime SDK for Qt
Operating System Version
After review by the development team, it has been determined that this issue is related to a known limitation with the software that lies outside of Esri's control. The issue's Additional Information section may contain further explanation.
This is a known issue at 10.2.x, due to the way the text symbols are originally designed for the ArcGIS Runtime SDK. The styling of text symbols and how it deals with outlines with differing widths and opacity is redesigned at Quartz, and matches the design used in ArcGIS Pro, so this is no longer an issue at the Quartz release.