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Miguel Angel Simon Sierra
580676bbf4
Dragging a clip past the video end fed back on itself: the growing preview length shrank the fit-to-width zoom, which remapped the pointer, moved the clip, and grew the length again (visible jumping). Split the committed basis duration (drives zoom) from the displayed effective duration (adds the live preview for ruler + width). Zoom holds fixed through the gesture and the extra length scrolls; it re-fits once on drop. Duration math extracted to pure tested helpers in timelineLayout.