chengsun/gtk-npapi-vlc — comment on commit a9c669a32cb1a45b4a2166bbc6c120e106d31f5b
File: npapi/vlcshell.cpp line 352
By chengsun:

Because window not only stores window id's, but also metadata such as the width and height of the window, which are updated on resize and needed by the GTK+ plugin.

(See https://github.com/chengsun/gtk-npapi-vlc/blob/master/npapi/vlcplugin_gtk.cpp#L395)