Remove all working directory entries when the buffer is cleared

Headers/iTerm/PTYTextView.h

@@ -434,6 +434,9 @@ typedef struct PTYFontInfo PTYFontInfo;
 // Returns true if any character in the buffer is selected.
 - (BOOL)isAnyCharSelected;
+// Clear working directories for when buffer is cleared
+- (void)clearWorkingDirectories;
+
 @end
 //

PTYSession.m

@@ -2158,6 +2158,7 @@ static NSString* SESSION_ARRANGEMENT_WORKING_DIRECTORY = @"Working Directory";
     //[TERMINAL cleanStream];
     [SCREEN clearBuffer];
+    [TEXTVIEW clearWorkingDirectories];
     // tell the shell to clear the screen
     //[self writeTask:[NSData dataWithBytes:&formFeed length:1]];
 }
@@ -2165,6 +2166,7 @@ static NSString* SESSION_ARRANGEMENT_WORKING_DIRECTORY = @"Working Directory";
 - (void)clearScrollbackBuffer
 {
     [SCREEN clearScrollbackBuffer];
+    [TEXTVIEW clearWorkingDirectories];
 }
 - (BOOL)exited

PTYTextView.m

@@ -2532,6 +2532,10 @@ static BOOL RectsEqual(NSRect* a, NSRect* b) {
                                                      targetSession:[dataSource session]];
 }
+- (void)clearWorkingDirectories {
+    [workingDirectoryAtLines removeAllObjects];
+}
+
 - (void)clearTextViewBuffer:(id)sender
 {
     [[dataSource session] clearBuffer];