* Remove unused `get_printer_preset` calls.
* `Plater::check_printer_initialized` should skip nozzle flow type checks if nozzle is unknown.
Also remove unnecessary `is_multi_extruders` check.
* Remove unused `CalibUtils::is_same_nozzle_diameters()` fn.
* Simplify `CalibUtils::check_printable_status_before_cali`.
The single-arity can delegate to the vectorized arity.
* Add `DevExtruderSystem::NozzleDiameterMatchesOrUnknown` to simply checks.
* Update `CalibrationPresetPage::update_sync_button_status()` to use `NozzleDiameterMatchesOrUnknown`.
Simplify logic by iterating over each extruder and checking for diameter and volume type match.
The previous code had several mistakes (from what I could tell):
- `curr_obj->is_multi_extruders()` doesn't imply exactly 2 extruders
- the single/multi branch served no purpose
- the single branch failed to check the volume type
* Specify `std::fabs` and add explicit import.
Ref: https://github.com/OrcaSlicer/OrcaSlicer/pull/13330#discussion_r3133613736
Not sure how idiomatic this is in C++ / OrcaSlicer codebase, but CoPilot suggested it and it seems reasonable.
---------
Co-authored-by: SoftFever <softfeverever@gmail.com>
8dd1dd8921