ConvertLegacyPositionsFile will convert the legacy positions file to the new format if: 1.

CursorKey returns a key that can be saved as a cursor that is never deleted.

New makes a new Positions.

Config describes where to get position information from.

Entry describes a positions file entry consisting of an absolute file path and the matching label set.

File format for the positions data.

LegacyFile is the copied struct for the static mode positions file.