patch 8.0.1459: cannot handle change of directory

Problem:    Cannot handle change of directory.
Solution:   Add the DirChanged autocommand event. (Andy Massimino,
            closes #888)  Avoid changing directory for 'autochdir' too often.

1 files changed, 12 insertions, 0 deletions

diff --git a/runtime/doc/autocmd.txt b/runtime/doc/autocmd.txt
index 4adf007e7..350ae7e88 100644
--- a/runtime/doc/autocmd.txt
+++ b/runtime/doc/autocmd.txt
@@ -295,6 +295,8 @@ Name			triggered by ~
 |FileChangedShellPost|	After handling a file changed since editing started
 |FileChangedRO|		before making the first change to a read-only file
 
+|DirChanged|		after the working directory has changed
+
 |ShellCmdPost|		after executing a shell command
 |ShellFilterPost|	after filtering with a shell command
 
@@ -633,6 +635,16 @@ FileChangedRO			Before making the first change to a read-only
 							*E881*
 				If the number of lines changes saving for undo
 				may fail and the change will be aborted.
+							*DirChanged*
+DirChanged			The working directory has changed in response
+				to the |:cd| or |:lcd| commands, or as a
+				result of the 'autochdir' option.
+				The pattern can be:
+					"window" to trigger on `:lcd
+					"global" to trigger on `:cd`
+					"auto"   to trigger on 'autochdir'.
+					"drop"	 to trigger on editing a file
+				<afile> is set to the new directory name.
 							*FileChangedShell*
 FileChangedShell		When Vim notices that the modification time of
 				a file has changed since editing started.