eec3a9a6a86a091749dfd01de6d167d4988c0b73  [line-clamp] Abspos whose containing block is an inline after the clamp point is visible

Classified as not security-relevant.
Triage note: setIsForcedHidden/isInsideInvisibleBox now take RenderElement and use container() so inline boxes starting after the clamp point are hidden too. Layout correctness refactor for line-clamp invisible boxes; no security bug.
This commit was flagged by the signal scorer and reviewed by AI (not a human). It is listed only so the triage is auditable; there is no root-cause analysis because this is not a vulnerability fix.

Structural signals: smartptr_member_added (+6.47), msg_medium (+2.0), msg_soft (+1.0), msg_noise (-2.5), area:Source/WebCore/layout (+2.0), surgical (+1.3)