[BUG] Backlash compensation for IDEX

[EYHJ59]

Did you test the latest bugfix-2.0.x code?

Yes, and the problem still exists.

Bug Description

For IDEX, when activate backlash compensation, layer shift is occurred.

Bug Timeline

Old one.

Expected behavior

No layer shift.

Actual behavior

No response

Steps to Reproduce

No response

Version of Marlin Firmware

Marlin V2.0.6

Printer model

No response

Electronics

No response

Add-ons

No response

Bed Leveling

No response

Your Slicer

No response

Host Software

No response

Additional information & file uploads

I changed add_correction_steps() (see below) and after that, I never seen layer shift.
My printer use X1/X2 motor and one Y motor.

void Backlash::add_correction_steps(const int32_t &da, const int32_t &db, const int32_t &dc, const uint8_t dm, block_t * const block) {

  static uint8_t last_direction_bits;
  if(backlash_extruder != active_extruder) {
    backlash_extruder = active_extruder;
    if(active_extruder == 0) last_direction_bits |= 0x01;
    else last_direction_bits &= 0xFE;
  }
  uint8_t changed_dir = last_direction_bits ^ dm;
  // Ignore direction change if no steps are taken in that direction
  if (da == 0) CBI(changed_dir, X_AXIS);
  if (db == 0) CBI(changed_dir, Y_AXIS);
  if (dc == 0) CBI(changed_dir, Z_AXIS);

  last_direction_bits ^= changed_dir;

  if (correction == 0) return;
  ~~~~~~~~~~~~~~~~~~~~~~~~~

I don't know my correction is right or not.
Can you check it is good or not?
Thank you in advance.

[ellensp]

Either a duplicate of #23325 or #23741

[thinkyhead]

Duplicate of #23325

[github-actions]

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