Ensure the selection does not change in setTextAndKeepSelection.

    @Override

    protected void onSelectionChanged(int selStart, int selEnd) {

        if (mInSetTextAndKeepSelection) return;

        // This code is copied from TextView.onDraw().  That code does not get

        // executed, however, because the WebTextView does not draw, allowing

        // webkit's drawing to show through.

    /* package */ void setTextAndKeepSelection(String text) {

        mPreChange = text.toString();

        Editable edit = (Editable) getText();

        int selStart = Selection.getSelectionStart(edit);

        int selEnd = Selection.getSelectionEnd(edit);

        mInSetTextAndKeepSelection = true;

        edit.replace(0, edit.length(), text);

        int newLength = edit.length();

        if (selStart > newLength) selStart = newLength;

        if (selEnd > newLength) selEnd = newLength;

        Selection.setSelection(edit, selStart, selEnd);

        mInSetTextAndKeepSelection = false;

        updateCachedTextfield();

    }