Added the hint SDL_HINT_ENABLE_SCREEN_KEYBOARD to control whether the on-screen keyboard should be shown when text input is active

Fixes https://github.com/libsdl-org/SDL/issues/7160

include/SDL3/SDL_hints.h

@@ -395,6 +395,17 @@ extern "C" {
  */
 #define SDL_HINT_EMSCRIPTEN_KEYBOARD_ELEMENT   "SDL_EMSCRIPTEN_KEYBOARD_ELEMENT"
 
+/**
+ *  \brief  A variable that controls whether the on-screen keyboard should be shown when text input is active
+ *
+ *  The variable can be set to the following values:
+ *    "0"       - Do not show the on-screen keyboard
+ *    "1"       - Show the on-screen keyboard
+ *
+ *  The default value is "1". This hint must be set before text input is activated.
+ */
+#define SDL_HINT_ENABLE_SCREEN_KEYBOARD "SDL_ENABLE_SCREEN_KEYBOARD"
+
 /**
  *  \brief  A variable that controls whether Steam Controllers should be exposed using the SDL joystick and game controller APIs
  *