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	Added KMOD_SCROLL to track the scroll lock state
Fixes https://github.com/libsdl-org/SDL/issues/4566
This commit is contained in:
		@@ -338,7 +338,7 @@ typedef enum
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    KMOD_NUM = 0x1000,
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    KMOD_CAPS = 0x2000,
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    KMOD_MODE = 0x4000,
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    KMOD_RESERVED = 0x8000,
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    KMOD_SCROLL = 0x8000,
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    KMOD_CTRL = KMOD_LCTRL | KMOD_RCTRL,
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    KMOD_SHIFT = KMOD_LSHIFT | KMOD_RSHIFT,
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@@ -767,6 +767,9 @@ SDL_SendKeyboardKeyInternal(Uint8 source, Uint8 state, SDL_Scancode scancode)
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        case SDLK_CAPSLOCK:
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            keyboard->modstate ^= KMOD_CAPS;
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            break;
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        case SDLK_SCROLLLOCK:
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            keyboard->modstate ^= KMOD_SCROLL;
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            break;
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        default:
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            keyboard->modstate |= modifier;
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            break;
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@@ -627,6 +627,7 @@ WIN_WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
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                SDL_ToggleModState(KMOD_CAPS, (GetKeyState(VK_CAPITAL) & 0x0001) != 0);
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                SDL_ToggleModState(KMOD_NUM, (GetKeyState(VK_NUMLOCK) & 0x0001) != 0);
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                SDL_ToggleModState(KMOD_SCROLL, (GetKeyState(VK_SCROLL) & 0x0001) != 0);
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            } else {
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                RECT rect;
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@@ -106,6 +106,7 @@ WIN_InitKeyboard(_THIS)
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    /* Are system caps/num/scroll lock active? Set our state to match. */
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    SDL_ToggleModState(KMOD_CAPS, (GetKeyState(VK_CAPITAL) & 0x0001) != 0);
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    SDL_ToggleModState(KMOD_NUM, (GetKeyState(VK_NUMLOCK) & 0x0001) != 0);
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    SDL_ToggleModState(KMOD_SCROLL, (GetKeyState(VK_SCROLL) & 0x0001) != 0);
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}
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void
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@@ -353,6 +353,32 @@ X11_GetNumLockModifierMask(_THIS)
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    return num_mask;
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}
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static unsigned
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X11_GetScrollLockModifierMask(_THIS)
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{
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    SDL_VideoData *viddata = (SDL_VideoData *) _this->driverdata;
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    Display *display = viddata->display;
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    unsigned num_mask = 0;
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    int i, j;
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    XModifierKeymap *xmods;
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    unsigned n;
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    xmods = X11_XGetModifierMapping(display);
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    n = xmods->max_keypermod;
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    for(i = 3; i < 8; i++) {
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        for(j = 0; j < n; j++) {
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            KeyCode kc = xmods->modifiermap[i * n + j];
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            if (viddata->key_layout[kc] == SDL_SCANCODE_SCROLLLOCK) {
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                num_mask = 1 << i;
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                break;
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            }
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        }
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    }
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    X11_XFreeModifiermap(xmods);
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    return num_mask;
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}
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static void
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X11_ReconcileKeyboardState(_THIS)
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{
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@@ -371,6 +397,7 @@ X11_ReconcileKeyboardState(_THIS)
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    if (X11_XQueryPointer(display, DefaultRootWindow(display), &junk_window, &junk_window, &x, &y, &x, &y, &mask)) {
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        SDL_ToggleModState(KMOD_CAPS, (mask & LockMask) != 0);
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        SDL_ToggleModState(KMOD_NUM, (mask & X11_GetNumLockModifierMask(_this)) != 0);
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        SDL_ToggleModState(KMOD_SCROLL, (mask & X11_GetScrollLockModifierMask(_this)) != 0);
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    }
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    keyboardState = SDL_GetKeyboardState(0);
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@@ -86,6 +86,8 @@ print_modifiers(char **text, size_t *maxlen)
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        print_string(text, maxlen, " CAPS");
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    if (mod & KMOD_MODE)
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        print_string(text, maxlen, " MODE");
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    if (mod & KMOD_SCROLL)
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        print_string(text, maxlen, " SCROLL");
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}
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static void
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@@ -86,6 +86,8 @@ print_modifiers(char **text, size_t *maxlen)
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        print_string(text, maxlen, " CAPS");
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    if (mod & KMOD_MODE)
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        print_string(text, maxlen, " MODE");
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    if (mod & KMOD_SCROLL)
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        print_string(text, maxlen, " SCROLL");
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}
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static void
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@@ -305,7 +305,7 @@ keyboard_getSetModState(void *arg)
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    KMOD_NUM |
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    KMOD_CAPS |
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    KMOD_MODE |
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    KMOD_RESERVED;
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    KMOD_SCROLL;
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   /* Get state, cache for later reset */
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   result = SDL_GetModState();
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