I was about to answer a question but realized that my answer depends on a key binding provided by a plugin I have installed. Even worse, I don't know which plugin provides it.
The only way I know to solve this problem would be to "binary search" my installed plugins by disabling half and enabling the other half. I use Vundle to manage my plugins so each iteration would only require me to comment out part of a plugin list but that's still a clumsy procedure.
Is there a better way to determine which plugin is responsible for a given key binding? Is there a way to determine if a given key binding is instead provided by my
vimrc file directly?
I realize Vim doesn't have a builtin notion of plugins, so maybe the question is more precisely phrased as "How can I determine which file containing vimscript is responsible for a given key binding?".