Fix a bug where a buried tmux gateway could not relay title changed...

Fix a bug where a buried tmux gateway could not relay title changed notifications to the proper PTYTab because it lacks a delegate.
Issue 5890

sources/PTYSession.h

@@ -156,10 +156,8 @@ typedef enum {
            hSpacing:(double)horizontalSpacing
            vSpacing:(double)verticalSpacing;
-// Notify the tab that this session, which is a tmux gateway, received a rename of a tmux window.
-- (void)sessionWithTmuxGateway:(PTYSession *)session
-       wasNotifiedWindowWithId:(int)windowId
-                     renamedTo:(NSString *)newName;
+// The tmux window title changed.
+- (void)sessionDidChangeTmuxWindowNameTo:(NSString *)newName;
 // Returns the objectSpecifier of the tab (used to identify a tab for Applescript).
 - (NSScriptObjectSpecifier *)objectSpecifier;

sources/PTYSession.m

@@ -5249,7 +5249,8 @@ ITERM_WEAKLY_REFERENCEABLE
 }
 - (void)tmuxWindowRenamedWithId:(int)windowId to:(NSString *)newName {
-    [_delegate sessionWithTmuxGateway:self wasNotifiedWindowWithId:windowId renamedTo:newName];
+    PTYSession *representativeSession = [[_tmuxController sessionsInWindow:windowId] firstObject];
+    [representativeSession.delegate sessionDidChangeTmuxWindowNameTo:newName];
     [_tmuxController windowWasRenamedWithId:windowId to:newName];
 }

sources/PTYTab.h

@@ -208,5 +208,5 @@ extern NSString *const iTermTabDidChangeWindowNotification;
 - (void)updateIcon;
 - (void)checkInvariants:(NSString *)when;
-
+- (void)setTmuxWindowName:(NSString *)tmuxWindowName;
 @end

sources/PTYTab.m

@@ -535,13 +535,8 @@ static void SetAgainstGrainDim(BOOL isVertical, NSSize *dest, CGFloat value) {
     return [[tabViewItem_ tabView] selectedTabViewItem] == tabViewItem_;
 }
-- (void)sessionWithTmuxGateway:(PTYSession *)session
-       wasNotifiedWindowWithId:(int)windowId
-                     renamedTo:(NSString *)newName {
-    PTYTab *tab = [session.tmuxController window:windowId];
-    if (tab) {
-        [tab setTmuxWindowName:newName];
-    }
+- (void)sessionDidChangeTmuxWindowNameTo:(NSString *)newName {
+    [self setTmuxWindowName:newName];
 }
 - (void)sessionSelectContainingTab {

sources/TmuxController.h

@@ -73,6 +73,7 @@ extern NSString *const kTmuxControllerSessionWasRenamed;
 - (PTYSession *)sessionForWindowPane:(int)windowPane;
 - (PTYTab *)window:(int)window;
+- (NSArray<PTYSession *> *)sessionsInWindow:(int)window;
 - (void)registerSession:(PTYSession *)aSession
                withPane:(int)windowPane
                inWindow:(int)window;

sources/TmuxController.m

@@ -569,6 +569,10 @@ static NSString *kListWindowsFormat = @"\"#{session_name}\t#{window_id}\t"
     return [[windows_ objectForKey:[NSNumber numberWithInt:window]] objectAtIndex:0];
 }
+- (NSArray<PTYSession *> *)sessionsInWindow:(int)window {
+    return [[self window:window] sessions];
+}
+
 - (BOOL)isAttached
 {
     return !detached_;