Method setMark

app/src/main/java/eu/faircode/email/StyleHelper.java:1140–1163

(EditText etBody, int start, int end, boolean select)

    }

    static boolean setMark(EditText etBody, int start, int end, boolean select) {
        Log.breadcrumb("style", "action", "mark");

        boolean has = false;
        Editable edit = etBody.getText();
        MarkSpan[] spans = edit.getSpans(start, end, MarkSpan.class);
        for (MarkSpan span : spans) {
            int s = edit.getSpanStart(span);
            int e = edit.getSpanEnd(span);
            int f = edit.getSpanFlags(span);
            edit.removeSpan(span);
            if (splitSpan(edit, start, end, s, e, f, true,
                    new MarkSpan(), new MarkSpan()))
                has = true;
        }

        if (!has)
            edit.setSpan(new MarkSpan(), start, end, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

        etBody.setText(edit);
        etBody.setSelection(select ? start : end, end);

        return true;
    }

    static boolean setSubscript(EditText etBody, int start, int end, boolean select) {
        Log.breadcrumb("style", "action", "subscript");