Overview

With -R, tree writes a sub-listing (00Tree.html) into each directory at the -L limit by calling emit_tree() recursively. The indent state lives in the global array dirs[], and indent() picks the glyph for level i by checking dirs[i+1]: nonzero means "a deeper level is still open", so it prints a continuation line instead of a branch. The recursive call inherits the outer walk's leftover dirs[] entries, so at the sub-listing's deepest level every branch prints as a continuation line. This change clears dirs[] before the nested emit_tree() — it is already saved and restored around it — so the sub-listing starts from the same state as a top-level run. The outer listing (top.html) is byte-identical before and after.

Steps to reproduce

$ mkdir -p r/a/{b/c,tail}
$ touch r/a/{b/f1,b/c/deep,tail/f2}
$ cd r && tree -L 2 -R -o top.html .
$ cat a/b/00Tree.html
./a/b
│   00Tree.html
│   c
│   └── deep
└── f1

2 directories, 3 files

After this change

$ mkdir -p r/a/{b/c,tail}
$ touch r/a/{b/f1,b/c/deep,tail/f2}
$ cd r && tree -L 2 -R -o top.html .
$ cat a/b/00Tree.html
./a/b
├── 00Tree.html
├── c
│   └── deep
└── f1

2 directories, 3 files