The Trim to Fill Selection commands let you automatically reveal underlying material in the gaps between clips, or before and after individual clips, as follow:
The start point of the clip behind the gap is automatically trimmed (expanded) to the previous clip, or as far as possible if there is not enough underlying material to cover the gap.
The end point of the clip in front of the gap is automatically trimmed (expanded) to the next clip, or as far as possible if there is not enough underlying material to cover the gap.
The start point of the clip is automatically trimmed (expanded) to the Edit selection start, or as far as possible if there is not enough underlying material to cover the selection, and the end point of the clip is automatically trimmed out (expanded) to the Edit selection end, or as far as possible if there is not enough underlying material to cover the selection.
The Trim to Fill Selection command is the inverse of the
Trim to Fit Selection command: where the
Trim to Fill Selection command trims a clip out to match the Edit selection, the
Trim to Fit Selection command trims a clip in to match the Edit selection.