Hi,
Non-selectable components can be selected in the Editor using Left mouse button then drag.
example:
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
Thank You