l_set_option() was passing the address of an int to
option_types[OPT_INT].set and option_types[OPT_BOOL].set.
That looks correct but is not: both function pointers
point to num_set(), which actually reads *(long *) str.
Change l_set_option() to pass the address of a long instead,
and add comments about this dependency.
(cherry picked from elinks-0.11 commit 8766e3829f)
(cherry picked from elinks-0.12 commit 0797f04921)
If a newline has a backslash in front of it, then str_rd replaces it
with a space. However, the newline was in the original config file,
so the line number must still be incremented.
Previously, it only pretended to rewrite the configuration file, so it
set or cleared OPT_MUST_SAVE but never changed or output any options.
Now, it actually sets the options when ELinks is loading the
configuration file. Also, when ELinks is rewriting the configuration
file, it now compares the values in the included file to the current
values of the options, and sets or clears OPT_MUST_SAVE accordingly.
So if ELinks is rewriting a configuration file that contains a "set"
command for a negated alias, then it properly writes the value of the
alias, rather than the value of the underlying option.
That is, let the setter function of the underlying option store the
negated value. Previously, redir_set used to tweak the value of the
option after it has already called the underlying setter.
Introduce get_option_shadow. This routine takes an option, the tree under which that option resides, and another tree. It returns a corresponding option with parallel ancestry in the second tree, creating that option and ancestry if it does not already exist.
Add enum copy_option_flags.
Add the CO_NO_LISTBOX_ITEM flag, which is used to suppress listbox creation for shadowed trees.
Add the CO_SHALLOW flag, which is used to suppress the duplication of unwanted children for shadowed trees.
Add a flags parameter to copy_option and tree_dup (and out of necessity, struct option_type_info and str_dup).
