HTML5 color selector broken on WebKit browsers

[kanflo]

WebKit browsers (macOS, iOS) send onchange for every change in color selection (including eg. sliding of RGB bars). This causes remi to send an update to the color widget, eg:

<input id="133167224621328" class="color" value="#beff4c" type="color" autocomplete="off" onchange="var params{};params['value']=document.getElementById('133167224621328').value;remi.sendCallbackParam('133167224621328','onchange',params);" data-parent-widget="133167224323712" style="margin:10px;width:30px;height:30px;position:static;order:-1"></input>

which in turn closes the color selector (and interrupts color selection). Chromium browsers on the other hand do not send onchange until the user closes the color picker. I did a workaround in send_message(...):

    if 'class="color"' in from_websocket(message):
        self._log.warning("ignoring message that would close the color picker on iOS")
        return True

A better solution would be to skip the message earlier, possibly based on the client browser.