✨ feat(tab-groups): add tab groups with color-coded inline grouping

ThirdParty/PSMTabBarControl/source/PSMTabBarCell.h

@@ -58,6 +58,16 @@
 @property(nonatomic) PSMProgress progress;
 @property(nonatomic) BOOL isProcessing;
 @property(nonatomic, assign) BOOL isPinned;
+@property(nonatomic, assign) BOOL isGroupHeader;
+@property(nonatomic, assign) BOOL isGroupMember;
+@property(nonatomic, assign) BOOL isGroupCollapsed;
+@property(nonatomic, assign) BOOL isGroupActive;
+@property(nonatomic, assign) BOOL isMultiSelected;
+@property(nonatomic, assign) CGFloat cellAlpha;
+@property(nonatomic, assign) BOOL isAnimatingCollapse;
+@property(nonatomic, copy) NSString *groupName;
+@property(nonatomic, retain) NSColor *groupColor;
+@property(nonatomic, assign) NSInteger groupMemberCount;
 
 // creation/destruction
 - (id)initWithControlView:(PSMTabBarControl *)controlView;

ThirdParty/PSMTabBarControl/source/PSMTabBarCell.m

@@ -185,7 +185,26 @@ @implementation PSMTabBarCell  {
     NSMutableArray<PSMCachedTitle *> *_subtitleCache;
     NSTrackingArea *_cellTrackingArea;
     NSTrackingArea *_closeButtonTrackingArea;
-}
+    BOOL _isGroupHeader;
+    BOOL _isGroupMember;
+    BOOL _isGroupCollapsed;
+    BOOL _isGroupActive;
+    BOOL _isMultiSelected;
+    CGFloat _cellAlpha;
+    NSString *_groupName;
+    NSColor *_groupColor;
+    NSInteger _groupMemberCount;
+}
+
+@synthesize isGroupHeader = _isGroupHeader;
+@synthesize isGroupMember = _isGroupMember;
+@synthesize isGroupCollapsed = _isGroupCollapsed;
+@synthesize isGroupActive = _isGroupActive;
+@synthesize isMultiSelected = _isMultiSelected;
+@synthesize cellAlpha = _cellAlpha;
+@synthesize groupName = _groupName;
+@synthesize groupColor = _groupColor;
+@synthesize groupMemberCount = _groupMemberCount;
 
 #pragma mark - Creation/Destruction
 
@@ -203,6 +222,15 @@ - (id)initWithControlView:(PSMTabBarControl *)controlView {
         _hasCloseButton = YES;
         _modifierString = [@"" copy];
         _truncationStyle = NSLineBreakByTruncatingTail;
+        _isGroupHeader = NO;
+        _isGroupMember = NO;
+        _isGroupCollapsed = NO;
+        _isGroupActive = NO;
+        _isMultiSelected = NO;
+        _cellAlpha = 1.0;
+        _groupName = nil;
+        _groupColor = nil;
+        _groupMemberCount = 0;
         [self setUpAccessibilityElement];
     }
     return self;

ThirdParty/PSMTabBarControl/source/PSMTabBarControl.h

@@ -157,6 +157,11 @@ extern PSMTabBarControlOptionKey PSMTabBarControlOptionPUAFontProvider;  // id<P
 - (BOOL)tabViewShouldDragWindow:(NSTabView *)tabView event:(NSEvent *)event;
 - (BOOL)tabViewShouldAllowDragOnAddTabButton:(NSTabView *)tabView;
 - (CGFloat)tabViewDesiredTabBarHeight:(NSTabView *)tabView;
+- (void)tabView:(NSTabView *)tabView didClickGroupHeaderTabViewItem:(NSTabViewItem *)tabViewItem;
+- (void)tabView:(NSTabView *)tabView doubleClickGroupHeaderTabViewItem:(NSTabViewItem *)tabViewItem;
+- (void)tabView:(NSTabView *)tabView willBeginDraggingGroupHeaderTabViewItem:(NSTabViewItem *)tabViewItem;
+- (NSMenu *)tabView:(NSTabView *)tabView menuForGroupHeaderTabViewItem:(NSTabViewItem *)tabViewItem;
+- (void)tabView:(NSTabView *)tabView groupTabViewItems:(NSArray<NSTabViewItem *> *)tabViewItems;
 
 @end
 
@@ -230,12 +235,22 @@ extern const CGFloat PSMTabBarProgressBarHeight;
 
 // tab information
 - (NSMutableArray *)representedTabViewItems;
+- (NSMutableArray<PSMTabBarCell *> *)cells;
 - (int)numberOfVisibleTabs;
 
 // special effects
 - (void)hideTabBar:(BOOL)hide animate:(BOOL)animate;
+- (void)update;
+- (void)update:(BOOL)animate;
+- (void)markNextInsertionsAsAnimated:(NSInteger)count;
+- (void)beginCollapseAnimationForTabViewItems:(NSArray<NSTabViewItem *> *)items completion:(void (^)(void))completion;
+- (void)cancelCollapseAnimation;
 - (BOOL)isTabBarHidden;
 
+// Frame of the cell displaying the given tab view item, in the receiver's
+// coordinate system. Returns NSZeroRect if no cell currently shows the item.
+- (NSRect)frameOfCellForTabViewItem:(NSTabViewItem *)item;
+
 // internal bindings methods also used by the tab drag assistant
 - (void)bindPropertiesForCell:(PSMTabBarCell *)cell andTabViewItem:(NSTabViewItem *)item;
 - (void)removeTabForCell:(PSMTabBarCell *)cell;
@@ -245,6 +260,7 @@ extern const CGFloat PSMTabBarProgressBarHeight;
 // Internal inset. Ensures nothing but background is drawn in this are.
 @property(nonatomic, assign) NSEdgeInsets insets;
 @property(nonatomic) CGFloat height;
+@property(nonatomic, assign) BOOL lastDragWasGroupHeader;
 
 - (void)setTabColor:(nullable NSColor *)aColor forTabViewItem:(NSTabViewItem *) tabViewItem;
 - (nullable NSColor*)tabColorForTabViewItem:(NSTabViewItem*)tabViewItem;