Arduino for STM32

with this bug i can't use the core 2.0.0 in my project.

if I want use platformio, which release has not the serial big data bug? 7.0.0 or can I use a newer?
https://github.com/platformio/platform-ststm32/releases

Hi,

I use the arduino IDE.
With core 1.9.0 and with Arduino nano I can easily receive over serialUSB a string with more then 200 chars

hier is a testsketch
String cmdstring = "";
bool command_available=false;

void setup() {
cmdstring.reserve(600);
Serial.begin(115200);
while (!Serial ...

Now it works without a workaround
I had select the Board part number: Gerneric F103CB
because with my screenresolution 1920 * 1080 I have not seen the maple Mini entry, because there is no scroll arrow below.
With the maple Mini entry it works

I have updated to the core 1.9.0
with this core the USBD_reenumerate with the bootloader2.0 does not work too

the workaround for the core 1.8.0 does not work either
viewtopic.php?p=2181#p2181

now I need for the core 1.9.0 a new workaround

The problem is:

With the orginal bootloader the USBD_reenumerate is working, because the USB_DISC Pin is high when leaving the bootloader.

With the bootloader2.0 the USB_DISC Pin is low when leaving the bootloader, the setting of USB_DISC Pin to low in the core 1.8.0 has
has no effect, because ...

I use this hardware

so that the USBD_reenumerate with the bootloader2.0 works,
the USB_DISC_PIN must be set to high once and then to low again

if I change the usbd_if.c in the core 1.8.0, the USBD_reenumerate works too

I have this as a test
stm32/1.8.0/cores/arduino/stm32/usb/usbd_if.c
#ifdef USB_DISC_PIN
pinMode ...

I have it tested, when I put this file "USBD_reenumerate.c" in my sketch directory, than it works with the bootloader2.0 also after a reset

#include "usbd_if.h"
#include "usbd_cdc_if.h"

#if ARDUINO < 10900

void USBD_reenumerate(void)
{
#ifndef USBD_REENUM_DISABLED
/* Re-enumerate the USB ...

Have you for me until the core 1.9.0 a better workaround than add this to my sketch? Can I fix it directly in the cores/arduino/stm32/usb/usbd_if.c ?