* src/treesit.c (Ftreesit_search_forward): Replace tabs with spaces.
For a tree like below, where START is marked by S, traverse as
numbered from 1 to 12:
- 12
- |
+ 12
+ |
S--------3----------11
| | |
o--o-+--o 1--+--2 6--+-----10
| | | |
o o +-+-+ +--+--+
- | | | | |
- 4 5 7 8 9
+ | | | | |
+ 4 5 7 8 9
Note that this function doesn't traverse the subtree of START, and it
always traverse leaf nodes first, then upwards. */)