Expose fuzzy search for issues/pulls

[6543]

Currently the backend option to use fuzzy search for issues is not exposed in the WebUI.

gitea/modules/indexer/issues/indexer.go

Line 283 in 7fdc048

func SearchIssues(ctx context.Context, opts *SearchOptions) ([]int64, int64, error) {

Is the backend func in question witch si controled via SearchOptions

To enable fuzzy search set

gitea/modules/indexer/issues/internal/model.go

Line 77 in 7fdc048

IsFuzzyKeyword bool // if false the levenshtein distance is 0

to true.