Add setting for whether to show document icon at title bar

Don't automatically hide the icon while in transparent title bar mode,
since it's a little confusing to the user. Instead, just use an extra
setting for that.

Also, when hiding the icon, properly hide it now by clearing it.
Previously it was just making an invisible icon which was still
draggable and didn't behave properly. Make sure after we set the setting
it's refreshed correctly.

Fix #1503

src/MacVim/Base.lproj/Preferences.xib

@@ -280,11 +280,11 @@
             <point key="canvasLocation" x="137.5" y="-17"/>
         </customView>
         <customView id="hr4-G4-3ZG" userLabel="Appearance">
-            <rect key="frame" x="0.0" y="0.0" width="483" height="360"/>
+            <rect key="frame" x="0.0" y="0.0" width="483" height="379"/>
             <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
             <subviews>
                 <customView id="fw0-VK-Nbz" userLabel="Dark mode selection">
-                    <rect key="frame" x="19" y="182" width="433" height="156"/>
+                    <rect key="frame" x="19" y="201" width="433" height="156"/>
                     <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                     <subviews>
                         <textField focusRingType="none" verticalHuggingPriority="750" horizontalCompressionResistancePriority="250" id="T40-Os-PUf" userLabel="Dark mode selection">
@@ -345,11 +345,11 @@
                     </subviews>
                 </customView>
                 <customView id="7af-iK-4r7" userLabel="Titlebar appearance">
-                    <rect key="frame" x="19" y="118" width="433" height="56"/>
+                    <rect key="frame" x="19" y="118" width="433" height="75"/>
                     <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                     <subviews>
                         <textField focusRingType="none" verticalHuggingPriority="750" horizontalCompressionResistancePriority="250" id="9Rk-gT-kVC" userLabel="Titlebar appearance">
-                            <rect key="frame" x="-2" y="38" width="187" height="17"/>
+                            <rect key="frame" x="-2" y="57" width="187" height="17"/>
                             <autoresizingMask key="autoresizingMask" flexibleMinY="YES"/>
                             <textFieldCell key="cell" sendsActionOnEndEditing="YES" alignment="right" title="Window appearance:" id="HEH-Lo-v4I" userLabel="Titlebar appearance:">
                                 <font key="font" metaFont="system"/>
@@ -358,7 +358,7 @@
                             </textFieldCell>
                         </textField>
                         <button id="7ie-0J-0Zr">
-                            <rect key="frame" x="189" y="37" width="244" height="18"/>
+                            <rect key="frame" x="189" y="56" width="244" height="18"/>
                             <autoresizingMask key="autoresizingMask" flexibleMinY="YES"/>
                             <buttonCell key="cell" type="check" title="Transparent title bar" bezelStyle="regularSquare" imagePosition="left" alignment="left" inset="2" id="hzd-hj-Pth">
                                 <behavior key="behavior" changeContents="YES" doesNotDimImage="YES" lightByContents="YES"/>
@@ -370,7 +370,7 @@
                             </connections>
                         </button>
                         <button id="Hqh-Ql-2od">
-                            <rect key="frame" x="189" y="19" width="244" height="18"/>
+                            <rect key="frame" x="189" y="38" width="244" height="18"/>
                             <autoresizingMask key="autoresizingMask" flexibleMinY="YES"/>
                             <buttonCell key="cell" type="check" title="Hidden title bar" bezelStyle="regularSquare" imagePosition="left" alignment="left" inset="2" id="W40-cB-m1U">
                                 <behavior key="behavior" changeContents="YES" doesNotDimImage="YES" lightByContents="YES"/>
@@ -381,8 +381,20 @@
                                 <binding destination="58" name="value" keyPath="values.MMNoTitleBarWindow" id="CKL-mo-ZhZ"/>
                             </connections>
                         </button>
+                        <button id="PoE-cf-3kL" userLabel="Show document icon at title bar">
+                            <rect key="frame" x="189" y="19" width="244" height="18"/>
+                            <autoresizingMask key="autoresizingMask" flexibleMinY="YES"/>
+                            <buttonCell key="cell" type="check" title="Show document icon at title bar" bezelStyle="regularSquare" imagePosition="left" alignment="left" inset="2" id="AvU-Lc-YNn" userLabel="Show document icon at title bar">
+                                <behavior key="behavior" changeContents="YES" doesNotDimImage="YES" lightByContents="YES"/>
+                                <font key="font" metaFont="system"/>
+                            </buttonCell>
+                            <connections>
+                                <action selector="appearanceChanged:" target="-2" id="e2x-W8-tpy"/>
+                                <binding destination="58" name="value" keyPath="values.MMTitlebarShowsDocumentIcon" id="svp-gP-mdE"/>
+                            </connections>
+                        </button>
                         <button id="s2M-pj-U8e">
-                            <rect key="frame" x="189" y="1" width="244" height="18"/>
+                            <rect key="frame" x="189" y="-1" width="244" height="18"/>
                             <autoresizingMask key="autoresizingMask" flexibleMinY="YES"/>
                             <buttonCell key="cell" type="check" title="No drop shadows" bezelStyle="regularSquare" imagePosition="left" alignment="left" inset="2" id="VM8-tg-mVV">
                                 <behavior key="behavior" changeContents="YES" doesNotDimImage="YES" lightByContents="YES"/>
@@ -496,7 +508,7 @@
                     </subviews>
                 </customView>
             </subviews>
-            <point key="canvasLocation" x="137.5" y="435"/>
+            <point key="canvasLocation" x="137.5" y="444.5"/>
         </customView>
         <customView id="Bnq-Nx-GJH" userLabel="Input">
             <rect key="frame" x="0.0" y="0.0" width="483" height="110"/>

src/MacVim/MMAppController.m

@@ -217,6 +217,7 @@ + (void)registerDefaults
         [NSNumber numberWithInt:0],       MMAppearanceModeSelectionKey,
         [NSNumber numberWithBool:NO],     MMNoTitleBarWindowKey,
         [NSNumber numberWithBool:NO],     MMTitlebarAppearsTransparentKey,
+        [NSNumber numberWithBool:YES],    MMTitlebarShowsDocumentIconKey,
         [NSNumber numberWithBool:NO],     MMZoomBothKey,
         @"",                              MMLoginShellCommandKey,
         @"",                              MMLoginShellArgumentKey,

src/MacVim/MMWindowController.h

@@ -42,6 +42,7 @@
     NSRect              preFullScreenFrame;
     MMWindow            *decoratedWindow;
     NSString            *lastSetTitle;
+    NSString            *documentFilename; ///< File name of document being edited, used for the icon at the title bar.
     int                 userRows;
     int                 userCols;
     NSPoint             userTopLeft;
@@ -57,6 +58,7 @@
 - (id)initWithVimController:(MMVimController *)controller;
 - (MMVimController *)vimController;
 - (MMVimView *)vimView;
+- (NSWindow *)window;
 - (NSString *)windowAutosaveKey;
 - (void)setWindowAutosaveKey:(NSString *)key;
 - (void)cleanup;
@@ -72,6 +74,7 @@
 - (void)zoomWithRows:(int)rows columns:(int)cols state:(int)state;
 - (void)setTitle:(NSString *)title;
 - (void)setDocumentFilename:(NSString *)filename;
+- (void)updateDocumentFilename;
 - (void)setToolbar:(NSToolbar *)toolbar;
 - (void)createScrollbarWithIdentifier:(int32_t)ident type:(int)type;
 - (BOOL)destroyScrollbarWithIdentifier:(int32_t)ident;

src/MacVim/MMWindowController.m

@@ -268,6 +268,7 @@ - (void)dealloc
     // in case processAfterWindowPresentedQueue wasn't called
     [afterWindowPresentedQueue release];  afterWindowPresentedQueue = nil;
     [lastSetTitle release]; lastSetTitle = nil;
+    [documentFilename release]; documentFilename = nil;
 
     [super dealloc];
 }
@@ -290,6 +291,11 @@ - (MMVimView *)vimView
     return vimView;
 }
 
+- (NSWindow *)window
+{
+    return decoratedWindow;
+}
+
 - (NSString *)windowAutosaveKey
 {
     return windowAutosaveKey;
@@ -503,6 +509,8 @@ - (void)setTitle:(NSString *)title
     }
 }
 
+/// Set the currently edited document's file path, passed in from Vim. Buffers with
+/// no file paths will be passed in as empty strings.
 - (void)setDocumentFilename:(NSString *)filename
 {
     if (!filename)
@@ -513,15 +521,22 @@ - (void)setDocumentFilename:(NSString *)filename
     if (![[NSFileManager defaultManager] fileExistsAtPath:filename])
         filename = @"";
 
+    [filename retain];
+    [documentFilename release];
+    documentFilename = filename;
+
+    [self updateDocumentFilename];
+}
+
+- (void)updateDocumentFilename
+{
+    if (documentFilename == nil)
+        return;
+    const bool showDocumentIcon = [[NSUserDefaults standardUserDefaults] boolForKey:MMTitlebarShowsDocumentIconKey];
+    NSString *filename = showDocumentIcon ? documentFilename : @"";
     [decoratedWindow setRepresentedFilename:filename];
     [fullScreenWindow setRepresentedFilename:filename];
 
-    if ([[NSUserDefaults standardUserDefaults] boolForKey:MMTitlebarAppearsTransparentKey]) {
-        // Remove the draggable file icon in the title bar for a clean look
-        // when we are in transparent titlebar mode.
-        [[decoratedWindow standardWindowButton:NSWindowDocumentIconButton] setImage: nil];
-        [[fullScreenWindow standardWindowButton:NSWindowDocumentIconButton] setImage: nil];
-    }
 }
 
 - (void)setToolbar:(NSToolbar *)theToolbar
@@ -613,6 +628,7 @@ - (void)refreshApperanceMode
 
     // Title may have been lost if we hid the title-bar. Reset it.
     [self setTitle:lastSetTitle];
+    [self updateDocumentFilename];
 
     // Dark mode only works on 10.14+ because that's when dark mode was
     // introduced.

src/MacVim/MacVimTests/MacVimTests.m

@@ -458,4 +458,52 @@ - (void) testGuifontSystemMonospace {
     [self waitForVimClose];
 }
 
+/// Test that document icon is shown in title bar when enabled.
+- (void) testTitlebarDocumentIcon {
+    MMAppController *app = MMAppController.sharedInstance;
+
+    [app openNewWindow:NewWindowClean activate:YES];
+    [self waitForVimOpenAndMessages];
+
+    NSWindow *win = [[[app keyVimController] windowController] window];
+
+    // Untitled documents have no icons
+    XCTAssertEqualObjects(@"", win.representedFilename);
+
+    // Test that the document icon is shown when a file (gui_mac.txt) is opened by querying "representedFilename"
+    [self sendStringToVim:@":help macvim\n" withMods:0];
+    [self waitForEventHandlingAndVimProcess];
+    NSString *gui_mac_path = [[NSBundle mainBundle] pathForResource:@"gui_mac.txt" ofType:nil inDirectory:@"vim/runtime/doc"];
+    XCTAssertEqualObjects(gui_mac_path, win.representedFilename);
+
+    // Change setting to hide the document icon
+    NSUserDefaults *ud = NSUserDefaults.standardUserDefaults;
+    NSDictionary<NSString *, id> *defaults = [ud volatileDomainForName:NSArgumentDomain];
+    NSMutableDictionary<NSString *, id> *newDefaults = [defaults mutableCopy];
+    newDefaults[MMTitlebarShowsDocumentIconKey] = @NO;
+    [ud setVolatileDomain:newDefaults forName:NSArgumentDomain];
+
+    // Test that there is no document icon shown
+    [app refreshAllAppearances];
+    XCTAssertEqualObjects(@"", win.representedFilename);
+
+    // Change setting back to show the document icon. Test that the path was remembered and icon is shown.
+    newDefaults[MMTitlebarShowsDocumentIconKey] = @YES;
+    [ud setVolatileDomain:newDefaults forName:NSArgumentDomain];
+    [app refreshAllAppearances];
+    XCTAssertEqualObjects(gui_mac_path, win.representedFilename);
+
+    // Close the file to go back to untitled document and make sure no icon is shown
+    [self sendStringToVim:@":q\n" withMods:0];
+    [self waitForEventHandlingAndVimProcess];
+    XCTAssertEqualObjects(@"", win.representedFilename);
+
+    // Restore settings to test defaults
+    [ud setVolatileDomain:defaults forName:NSArgumentDomain];
+
+    // Clean up
+    [[app keyVimController] sendMessage:VimShouldCloseMsgID data:nil];
+    [self waitForVimClose];
+}
+
 @end

src/MacVim/Miscellaneous.h

@@ -37,6 +37,7 @@ extern NSString *MMFontPreserveLineSpacingKey;
 extern NSString *MMAppearanceModeSelectionKey;
 extern NSString *MMNoTitleBarWindowKey;
 extern NSString *MMTitlebarAppearsTransparentKey;
+extern NSString *MMTitlebarShowsDocumentIconKey;
 extern NSString *MMNoWindowShadowKey;
 extern NSString *MMDisableLaunchAnimationKey;
 extern NSString *MMLoginShellKey;

src/MacVim/Miscellaneous.m

@@ -33,6 +33,7 @@
 NSString *MMAppearanceModeSelectionKey    = @"MMAppearanceModeSelection";
 NSString *MMNoTitleBarWindowKey           = @"MMNoTitleBarWindow";
 NSString *MMTitlebarAppearsTransparentKey = @"MMTitlebarAppearsTransparent";
+NSString *MMTitlebarShowsDocumentIconKey  = @"MMTitlebarShowsDocumentIcon";
 NSString *MMNoWindowShadowKey             = @"MMNoWindowShadow";
 NSString *MMDisableLaunchAnimationKey     = @"MMDisableLaunchAnimation";
 NSString *MMLoginShellKey                 = @"MMLoginShell";