By default, a search is ended without go through all the tag files listed in GTAGSLIBPATH when tags are found in a project's tag file. This behavior may be unintended if there are definitions with the same name as the one defined in a project.
When through_all_tags = 1, unite-gtags adds --through option to global command and it makes a search go through all the tag files listed in GTAGSLIBPATH.
This PR is adding "--through" option support.
By default, a search is ended without go through all the tag files listed in GTAGSLIBPATH when tags are found in a project's tag file. This behavior may be unintended if there are definitions with the same name as the one defined in a project.
When
through_all_tags = 1,unite-gtagsadds--throughoption toglobalcommand and it makes a search go through all the tag files listed in GTAGSLIBPATH.