Merge branch 'sc/wt-status-avoid-quadratic-insertion' into jch

The enumeration of untracked and ignored files in 'git status' has been optimized by avoiding quadratic complexity when inserting into string lists, reducing the construction cost from O(n^2) to O(n log n). * sc/wt-status-avoid-quadratic-insertion: wt-status: avoid repeated insertion for untracked paths