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[thakoreh]

Problem

The slice filter incorrectly appends the fill_with value to every slice when the iterable length is evenly divisible by the slice count.

Before (buggy):

{% set a = [1, 2, 3, 4] %}
{{ a|slice(4, "foo")|list }}

Output: [[1, "foo"], [2, "foo"], [3, "foo"], [4, "foo"]]

After (fixed):
Output: [[1], [2], [3], [4]]

Root Cause

When length % slices == 0, slices_with_extra is 0. The fill condition slice_number >= slices_with_extra becomes slice_number >= 0, which is always true, so every slice gets the fill value appended.

Fix

Added slices_with_extra > 0 guard to the fill condition, so fill values are only applied when there is actually a remainder to distribute:

# Before
if fill_with is not None and slice_number >= slices_with_extra:
# After
if fill_with is not None and slices_with_extra > 0 and slice_number >= slices_with_extra:

Tests

10 new tests in tests/test_slice_fill_fix.py:

• 5 tests for even division (4/4, 6/3, 8/4, 1/1, 10/5)
• 3 tests for remainder cases (5/3, 7/3, 3/4)
• 2 tests for no-fill variants

Fixes #2118