The launcher read no controller at all. Started from Steam (Desktop or Game
Mode on a Steam Deck), Steam Input applies the game's gamepad layout to it,
where the right trackpad is the right stick and its click is R3, so the
trackpad did nothing; only the touch screen, which arrives as mouse
messages, worked.
- Every XInput pad is merged (Xbox, Steam Input's virtual pad), else a
DualShock 4 / DualSense is read over HID with the reader the in-game menu
already uses, now its own library (dingosdk_playstation_input).
- D-pad and left stick move ImGui's focus, outlined in the launcher's blue;
A / Cross presses. The hand-drawn tiles, switches and menu buttons take
part in navigation (ImGuiButtonFlags_EnableNav).
- B / Circle closes an open combo or menu and leaves a text field, and is
Escape otherwise, which the launcher's pages already go back on. Escape
now also closes the mod overviews and answers Cancel in the uninstall and
replace confirmations; closing an overview no longer also leaves the page.
- The right stick (the trackpad) moves a pointer that ImGui draws, and R3
(the trackpad's click) is the left button. The system cursor follows it;
a mouse move or a touch elsewhere takes the pointer back.
- The ImGui Win32 backend's own gamepad code (slot 0 only) is compiled out
so it cannot fight the launcher's events; nothing else used it.
