Only generate key repetition for keys that should repeat on wayland.

This fix repetition on modifier keys, e.g. Control.

src/video/wayland/SDL_waylandevents.c

@@ -987,7 +987,9 @@ keyboard_handle_key(void *data, struct wl_keyboard *keyboard,
                 SDL_SendKeyboardText(text);
             }
         }
-        keyboard_repeat_set(&input->keyboard_repeat, time, scancode, has_text, text);
+        if (input->xkb.keymap && WAYLAND_xkb_keymap_key_repeats(input->xkb.keymap, key + 8)) {
+            keyboard_repeat_set(&input->keyboard_repeat, time, scancode, has_text, text);
+        }
     }
 }
 

src/video/wayland/SDL_waylandsym.h

@@ -122,6 +122,7 @@ SDL_WAYLAND_SYM(int, xkb_state_key_get_syms, (struct xkb_state *, xkb_keycode_t,
 SDL_WAYLAND_SYM(int, xkb_keysym_to_utf8, (xkb_keysym_t, char *, size_t) )
 SDL_WAYLAND_SYM(struct xkb_keymap *, xkb_keymap_new_from_string, (struct xkb_context *, const char *, enum xkb_keymap_format, enum xkb_keymap_compile_flags))
 SDL_WAYLAND_SYM(struct xkb_state *, xkb_state_new, (struct xkb_keymap *) )
+SDL_WAYLAND_SYM(int, xkb_keymap_key_repeats, (struct xkb_keymap *keymap, xkb_keycode_t key) );
 SDL_WAYLAND_SYM(void, xkb_keymap_unref, (struct xkb_keymap *) )
 SDL_WAYLAND_SYM(void, xkb_state_unref, (struct xkb_state *) )
 SDL_WAYLAND_SYM(void, xkb_context_unref, (struct xkb_context *) )