Bed calibration fails when home offset is not zero

[edwinvers]

With a quick-swap kit and bracing kit installed on my A350 the nozzle deviates from the (X0, Y0)-position on the bed. This can be corrected by:

M206 X-17.00 Y-14.00 ; set offse to home position
M500 ; save settings to eeprom
G28 ; home all axes
G90 ; absolute positioning
G0 X0 Y0 Z10 ; move to origin of the bed

After this the nozzle is located at the (0,0) position of the bed.

However, when proceeding with the calibration-routine for leveling the bed, the routine fails on the outer position of the grid in Y-direction.

I fixed it in my local repository for my A350 by making changes to \src\module\linear.cpp, lines 661 and further:

if (linear_p->machine_size() == MACHINE_SIZE_A250 || linear_p->machine_size() == MACHINE_SIZE_A350) {
    if (kit_combination_type & QUICK_CHANGE_ADAPTER_MSK) {
      X_MAX_POS += INSTALL_QUICK_CHANGE_ADAPTER_LENGTH_CHANGE_X;
      Y_MAX_POS += INSTALL_QUICK_CHANGE_ADAPTER_LENGTH_CHANGE_Y;
      Z_MAX_POS += INSTALL_QUICK_CHANGE_ADAPTER_LENGTH_CHANGE_Z;

      X_DEF_SIZE += INSTALL_QUICK_CHANGE_ADAPTER_LENGTH_CHANGE_X;
      Y_DEF_SIZE += INSTALL_QUICK_CHANGE_ADAPTER_LENGTH_CHANGE_Y;
      Z_DEF_SIZE += INSTALL_QUICK_CHANGE_ADAPTER_LENGTH_CHANGE_Z;

      MAGNET_X_SPAN +=  INSTALL_QUICK_CHANGE_ADAPTER_LENGTH_CHANGE_X;
      MAGNET_Y_SPAN +=  INSTALL_QUICK_CHANGE_ADAPTER_LENGTH_CHANGE_Y;      
    }
  }

  if (linear_p->machine_size() != MACHINE_SIZE_UNKNOWN) {
    if (kit_combination_type & REINFORCEMENT_KIT_MSK) {
      X_MAX_POS += REINFORCEMENT_KIT_LENGTH_CHANGE_X;
      Y_MAX_POS += REINFORCEMENT_KIT_LENGTH_CHANGE_Y;
      Z_MAX_POS += REINFORCEMENT_KIT_LENGTH_CHANGE_Z;

      X_DEF_SIZE += REINFORCEMENT_KIT_LENGTH_CHANGE_X;
      Y_DEF_SIZE += REINFORCEMENT_KIT_LENGTH_CHANGE_Y;
      Z_DEF_SIZE += REINFORCEMENT_KIT_LENGTH_CHANGE_Z;

      MAGNET_X_SPAN += REINFORCEMENT_KIT_LENGTH_CHANGE_X;
      MAGNET_Y_SPAN += REINFORCEMENT_KIT_LENGTH_CHANGE_Y;
    }
  }

Please review these proposed changes and decide if this can me merged into main.