SDL2: A and B buttons swapped on Switch Pro Controller

[DJtheMan2101]

The current profile for the Nintendo Switch Pro Controller on the SDL2 controller driver (sdl2/Nintendo Switch Pro Controller.cfg) appears to have the inputs for RetroPad-A and RetroPad-B swapped, which can be seen easily enough from Remote RetroPad. The Pro Controller's A (right face) button maps to RetroPad-B (bottom), and Pro Controller-B (bottom) maps to RetroPad-A (right).

The issue does not affect any other buttons, and all the labels are in the correct positions (so only the inputs themselves are swapped). Setting input_a_btn = "0" (instead of 1) and input_b_btn = "1" (instead of 0) fixes the issue.

Tested on macOS Sonoma 14.7.1 with RetroArch 1.19.1 (nightly 3d8c981ac). I first noticed it on a self-compiled Linux build from June 2024. Maybe a recent SDL2 update swapped the button mappings?