Method isPrintableChar

app/src/main/java/eu/faircode/email/Helper.java:2386–2391

(int codepoint)

    }

    static boolean isPrintableChar(int codepoint) {
        Character.UnicodeBlock block = Character.UnicodeBlock.of(codepoint);
        if (block == null || block == Character.UnicodeBlock.SPECIALS)
            return false;
        return !Character.isISOControl(codepoint);
    }
    // https://issuetracker.google.com/issues/37054851

    static String getPrintableString(String value, boolean debug) {