GraphicsLayer :: GraphicIDs (x, y, tolerance, numberOfResults = 10) only returns IDs of visible graphics.
Last Published: May 9, 2015ArcGIS Runtime SDK for Qt
Bug ID Number
February 6, 2015
June 11, 2020
ArcGIS Runtime SDK for Qt
Will Not Be Addressed
The development team has considered the issue or request and concluded it will not be addressed. The issue's Additional Information section may contain further explanation.
The documentation for the API is now changed to talked about the correct behavior.
Instead of setting the visibility of the desired graphics to false, set the alpha value of the graphics' color to 0 to mimic invisibility. This way when the method is called all graphic ids are returned.