[Code scan] Detect merge_prim_cell extended mismatches independent of argument order

[njzjz]

This issue comes from a Codex global scan of deepmodeling/tbplas at commit 4d3652b.

Severity: Low

merge_prim_cell() tries to reset extended to 1.0 when component cells have incompatible extended values, but it only checks pc.extended - extended >= 1.e-3. If the first cell has a larger value than a later cell, the difference is negative and the mismatch is missed.

Code reference:

tbplas/tbplas/builder/advanced.py

Lines 363 to 370 in 4d3652b

	# Determine the 'extended' attribute
	extended = pc_list[0].extended
	for pc in pc_list:
	if (pc.extended - extended) >= 1.e-3:
	print(f"INFO: resetting extend to 1.0")
	extended = 1.0
	break
	merged_cell.extended = extended

Suggested fix: compare with abs(pc.extended - extended).