API: Refactor vim_{get,set}_var

- Change in dict_set_value: Passing 'nil' as value will delete the
  variable.
- Change in dict_get_value: Removed 'pop' parameter, now values can be popped
  by passing 'nil' to dict_set_value
- Update {buffer,window,tabpage}_get_var to reflect the changes

1 files changed, 2 insertions, 3 deletions

diff --git a/src/api/helpers.h b/src/api/helpers.h
index 9f24455b27..afa16e54f4 100644
--- a/src/api/helpers.h
+++ b/src/api/helpers.h
@@ -26,12 +26,11 @@ bool try_end(Error *err);
 ///
 /// @param dict The vimscript dict
 /// @param key The key
-/// @param bool If true it will pop the value from the dict
 /// @param[out] err Details of an error that may have occurred
-Object dict_get_value(dict_T *dict, String key, bool pop, Error *err);
+Object dict_get_value(dict_T *dict, String key, Error *err);
 
 /// Set a value in a dict. Objects are recursively expanded into their
-/// vimscript equivalents.
+/// vimscript equivalents. Passing 'nil' as value deletes the key.
 ///
 /// @param dict The vimscript dict
 /// @param key The key