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LibreCAD 2D Architecture: From addHistory to RS_UndoCycle, Two History and Undo Systems

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【LibreCAD 2D架构】从 addHistory 到 RS_UndoCycle：LibreCAD 里的两套 History 与撤销机制

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Ranking history & source details

First recorded Sep 13, 2026, 9:30 AM CST · latest Sep 15, 2026, 8:28 AM CST. Ranks reflect attention on each platform.

Retained daily observations
DayPlatformBest rankLast rank
2026-09-15CSDN#14#14
2026-09-14CSDN#21#21
2026-09-13CSDN#16#16
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