I've recently switched to vim and installed the airline and NERDTree plugins. This combo works nice, displaying the tree in its own window and putting opened files in buffers.
When the NERDTree window is focused, right-clicking on the buffer "buttons", which airline comes with out-of-the box, the window content gets replaced by the buffer content, e.g. shows the file content.
Is there a way to make the window immutable and reserved for NERDTree only?