Delete is indeed an unprintable character.

b520d619 · Sam Lantinga · 3a9c617f · b520d619
Commit b520d619 authored Jul 21, 2010 by Sam Lantinga
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SDL_keyboard.c src/events/SDL_keyboard.c +1 -1

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--- a/src/events/SDL_keyboard.c
+++ b/src/events/SDL_keyboard.c
@@ -766,7 +766,7 @@ SDL_SendKeyboardText(const char *text)
    int posted;

    /* Don't post text events for unprintable characters */
-    if (*text < ' ') {
+    if (*text < ' ' || *text == 127) {
        return 0;
    }