This bug is subtle! Opening a directory node in a new tab (with the
"t" or "T" mappings) would previously fail and require a refresh
because it called the directory node's "activate()" method.
In reviewing that method (i.e., "activate()"), I discovered that the
directory node's NERDTree is rendered before the method returns,
which overwrites the content of the tree in the new tab or window.
To clarify, when "t" or "T" is used on a directory node, a new
directory node and tree must be created to be rendered in a new tab.
So, calling "self.getNerdtree().render()" at the bottom of
"activate()" will render the NERDTree instance from which "t" or "T"
was invoked, not the new NERDTree that is being displayed. This
overwrites the new NERDTree text, and, thus, a refresh is required.
Since a call to "render()" is almost always necessary at the bottom
of "activate()" to keep everything in sync for other mappings, we
avoid this problem entirely by using the "open()" method directly
(works for files and directories) in the callbacks.
Fixes#549.
ae1c95bcbc