Update touch bar tab titles immediately when they change because of an escape code. Issue 6164

sources/PTYTab.m

@@ -529,6 +529,7 @@ static void SetAgainstGrainDim(BOOL isVertical, NSSize *dest, CGFloat value) {
 - (void)nameOfSession:(PTYSession*)session didChangeTo:(NSString*)newName {
     if ([self activeSession] == session) {
         [tabViewItem_ setLabel:newName];
+        [self.realParentWindow tabTitleDidChange:self];
     }
 }

sources/PseudoTerminal.m

@@ -1175,6 +1175,10 @@ ITERM_WEAKLY_REFERENCEABLE
     return (PTYTab *)session.delegate;
 }
+- (void)tabTitleDidChange:(PTYTab *)tab {
+    [self updateTouchBarIfNeeded];
+}
+
 // Allow frame to go off-screen while hotkey window is sliding in or out.
 - (BOOL)terminalWindowShouldConstrainFrameToScreen {
     iTermProfileHotKey *profileHotKey = [[iTermHotKeyController sharedInstance] profileHotKeyForWindowController:self];

sources/WindowControllerInterface.h

@@ -228,6 +228,8 @@ typedef NS_ENUM(NSInteger, BroadcastMode) {
 // Returns the tab associated with a session.
 - (PTYTab *)tabForSession:(PTYSession *)session;
+- (void)tabTitleDidChange:(PTYTab *)tab;
+
 #pragma mark - Sessions
 // Set the session name. If theSessionName is nil then set it to the pathname