Add Use Active Window With BufExplorer as a vim til

vim/use-active-window-with-bufexplorer.md

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+# Use Active Window With BufExplorer
+
+I often use [BufExplorer](https://github.com/jlanzarotta/bufexplorer) within
+long-running Vim sessions as a way of quickly jumping between the various
+buffers in my buffer list. After working with one buffer, I use `<leader>bs`
+to open BufExplorer, move my cursor to the next buffer of interest, and hit
+enter to open it in place of the current buffer. This is the default
+behavior at least.
+
+There is a setting on BufExplorer (`g:bufExplorerFindActive`) that is
+toggled on by default. Because of this setting, BufExplorer finds the window
+that was active before accessing the BufExplorer window when opening a
+buffer. If this setting is toggled off, BufExplorer doesn't bother finding
+the active window, it just opens the buffer up in place of itself in
+whatever split window was created for itself.
+
+This setting can be toggled within the BufExplorer window by hitting `f`. It
+will toggle between `Locate Buffer` and `Don't Locate Buffer`. I prefer the
+default of `Locate Buffer`.