wayland: Pass --no-wrap to Zenity. There seems to be a bug where it can wrap the text based on the minimum possible window size, which can be worked around with --no-wrap. This technically uncaps the width entirely, but this isn't wildly different from what other backends do.
diff --git a/src/video/wayland/SDL_waylandmessagebox.c b/src/video/wayland/SDL_waylandmessagebox.c
index e1a71c6..50869a5 100644
--- a/src/video/wayland/SDL_waylandmessagebox.c
+++ b/src/video/wayland/SDL_waylandmessagebox.c
@@ -32,7 +32,7 @@ Wayland_ShowMessageBox(const SDL_MessageBoxData *messageboxdata, int *buttonid)
#define ZENITY_CONST(name, str) \
const char *name = str; \
const size_t name##_len = SDL_strlen(name);
- ZENITY_CONST(zenity, "zenity --question --switch --icon-name=dialog-")
+ ZENITY_CONST(zenity, "zenity --question --switch --no-wrap --icon-name=dialog-")
ZENITY_CONST(title, "--title=")
ZENITY_CONST(message, "--text=")
ZENITY_CONST(extrabutton, "--extra-button=")