Non-selectable components can be selected in the Editor using Left mouse button then drag.
textComp->bSelectable = false; // textComp is UTextRenderComponent // this will cuz this textComp to be non-selectable using left mouse click, this is great. // but if I use mouse drag then it will be selected, = Bug .
BTW , I have posted another bug report about spline component , which is a different issue, cuz it is stay selectable even with normal mouse click ! post link