Treebrowser plugin and relative path in project settings

[arhiv6]

Treebrowser plugin works incorrectly, if in project settings has relative path. Problem in treebrowser/src/treebrowser.c file. The problem appears when use (pseudocode):
GeanyProject *project = geany->app->project;
dir = project->base_path ;
and not checked the path type - absolute or relative base_path.
The correct realization in the file geany-plugins/projectorganizer/src/prjorg-utils.c (function gchar *get_project_base_path(void)).

A similar issue: geany/geany#686