Provided by: libsdl3-doc_3.2.20+ds-2_all 

NAME
SDL_HINT_GDK_TEXTINPUT_MAX_LENGTH - This variable sets the maximum input length of the TextInput window
on GDK platforms.
SYNOPSIS
#include <SDL3/SDL_hints.h>
#define SDL_HINT_GDK_TEXTINPUT_MAX_LENGTH "SDL_GDK_TEXTINPUT_MAX_LENGTH"
DESCRIPTION
The value must be a stringified integer, for example "10" to allow for up to 10 characters of text input.
This hint is available only if SDL_GDK_TEXTINPUT defined.
This hint should be set before calling SDL_StartTextInput()
AVAILABILITY
This hint is available since SDL 3.2.0.
Simple Directmedia Layer SDL 3.2.20 SDL_HINT_GDK_TEXTINPUT_MAX_LENGTH(3)