[FIX #142] Truncate text in titlebar at head position (#149)

* [FIX #142] Truncate text in titlebar at head position
* fix indentation

adjustments by @monkeydom:
* Adjusted the mode of opertation for this fix slightly.
  * Configuring the NSTextField and then just removing the preset attributes vs updating the ParagraphAttributes of the title each time.
(might be worse if the AttributedTitle is needed for something else)
  * Went to fetch the NSTextField of the window a little bit differently with less hierarchy traversal.
(might break differently if Apple ever changes it, but feels a little bit better)
  * Fixed issue where the window title synchronization did load the window earlier than it needs to be loaded in terms of the default lifecycle of the NSWindowController

Author: fourplusone

SubEthaEdit-Mac/Source/PlainTextWindowController.m

@@ -72,9 +72,19 @@ - (void)windowWillLoad {
 }
 
 - (void)windowDidLoad {
-	NSWindow *window = self.window;
+    NSWindow *window = self.window;
     [[window contentView] setAutoresizesSubviews:YES];
-	[self updateWindowMinSize];
+
+    NSTextField *titleBarTextField = [self SEE_titlebarTextField];
+    
+    // Configure the truncation here
+    if (titleBarTextField) {
+        titleBarTextField.allowsDefaultTighteningForTruncation = YES;
+        titleBarTextField.lineBreakMode = NSLineBreakByTruncatingHead;
+        titleBarTextField.maximumNumberOfLines = 1;
+    }
+
+    [self updateWindowMinSize];
 }
 
 
@@ -453,9 +463,9 @@ - (void)updateLock {
 
 - (void)synchronizeWindowTitleWithDocumentName {
     [super synchronizeWindowTitleWithDocumentName];
-    
-    NSWindowTab *tab = self.window.tab;
-    tab.title = self.plainTextDocument.displayName;
+    if (self.windowLoaded) { // Don't trigger load of window prematurely
+        [self SEE_postprocessUpdateOfWindowTitle];
+    }
 
     [self updateLock];
 }
@@ -573,6 +583,29 @@ - (void)updateWindowMinSize {
 	}
 }
 
+- (NSTextField *)SEE_titlebarTextField {
+    NSButton *closeButton = [self.window standardWindowButton:NSWindowCloseButton];
+    if ([closeButton.superview isKindOfClass:NSClassFromString(@"NSTitlebarView")]) {
+        // return first NSTextField of that
+        for (id view in closeButton.superview.subviews) {
+            if ([view isKindOfClass:[NSTextField class]]) {
+                return view;
+            }
+        }
+    }
+    return nil;
+}
+
+- (void)SEE_postprocessUpdateOfWindowTitle {
+    NSWindowTab *tab = self.window.tab;
+    tab.title = self.plainTextDocument.displayName;
+    
+    // clean out the attributed title and use the configuraiton of the textfield -
+    // if that is too radical we could just adjust the linebreakmode
+    // of the read attributed string and set it again on the text field
+    NSTextField *titlebarTextField = [self SEE_titlebarTextField];
+    titlebarTextField.stringValue = titlebarTextField.attributedStringValue.string;
+}
 
 #pragma mark - Dialog Split