DataGrid: Fix the banded Columns' vertical borders (T1318812)#32802

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Alyar666 wants to merge 13 commits intoDevExpress:26_1from

Alyar666:T1318812_26_1_attempt_3

Commits on Mar 18, 2026

Revert the fix for T1282595
Alyar
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separate TestCafe tests into functional and visual tests
Alyar
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Move first-header class logic from sticky_columns to column_headers
Alyar
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Fix lint: use for-of loops in matrix functional test
Alyar
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Fix e2e tests (part 1)
Alyar
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Update etalons
Alyar
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Update etalons (part 2)
Alyar
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Fix e2e tests
Alyar
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fix: use .dx-header-row instead of .dx-row in multi-row header border selectors
Alyar
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Update etalons (part 3)
Alyar
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Commits on Mar 19, 2026