Also fixes incorrect location of `tv_dict_add` function and three bugs in other
functions:
1. `tv_dict_add_list` may free list it does not own (vim/vim#1555).
2. `tv_dict_add_dict` may free dictionary it does not own (vim/vim#1555).
3. `tv_dict_add_dict` ignores `key_len` argument.
Additional modifications:
- More `const` qualifiers in tested functions.
- `tv_list_find_str()` second argument is more in-line with other
`tv_list_find*()` functions.
Tests crash at some point without
- `after_each(collectgarbage)` right before “typval.c list copy() copies list
correctly and converts items” test.
- Commenting out that test.
- Adding `collectgarbage()` after the test (what actually this commit does).
Adding `collectgarbage()` to top-level `after_each` block right after
`restore_allocators` makes running this file crash even if it is run alone.
Also found some bugs:
1. var_item_copy() always fails to copy v:_null_list and v:_null_dict. Fixing
this should mean fixing `deepcopy(v:_null_list)` which should’ve been, but
was not listed in #4615. This also fixes `deepcopy(v:_null_dict)`.
2. var_item_copy() crashes when trying to copy NULL string with `conv != NULL`.
3. `conv` argument is ignored when copying list unless `deep` is true, but it
was not reflected in documentation.
4. `tv_dict_item_alloc_len()` allocated more memory then needed.
5. typvalt2lua was not able to handle self-referencing containers.
The directory name could contain special characters that trips up the
matching used by find. Instead, let's just make sure that the filename
starts with the directory name.
Used
sed -r -i -e '/ helpers =/ s/$/\nlocal itp = helpers.gen_itp(it)/; s/^(\s*)it\(/\1itp(/' test/unit/**/*_spec.lua
to alter all tests. Locally they all run fine now.
Reasoning:
1. General: state from one test should not affect other tests.
2. Local: travis build is failing with something which may be an output of
garbage collector. This should prevent state of the garbage collector from
interferring as well.
