The old version resulted in
error: this condition has identical branches [-Werror=duplicated-branches]
| (dlg ? typeid(*dlg) : typeid(T)).name());
| ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
from gcc 10 when compiling with -O2.
Change the code to avoid using this condition entirely: not only this
avoids the warning, but it also makes it unnecessary to make
wxGetDialogClassDescription() function a template, so should result in
slightly faster compilation and smaller code size too.
No real changes.
f9780847b8