fix: bring back mouse hover selection (closes #2317)

src/logic/Preferences.swift

@@ -29,7 +29,7 @@ class Preferences {
         "quitAppShortcut": "Q",
         "hideShowAppShortcut": "H",
         "arrowKeysEnabled": "true",
-        "mouseHoverEnabled": "true",
+        "mouseHoverEnabled": "false",
         "cursorFollowFocusEnabled": "false",
         "showMinimizedWindows": ShowHowPreference.show.rawValue,
         "showMinimizedWindows2": ShowHowPreference.show.rawValue,

src/logic/Windows.swift

@@ -36,11 +36,11 @@ class Windows {
         if let app = Applications.find(NSWorkspace.shared.frontmostApplication?.processIdentifier),
            app.focusedWindow == nil,
            let lastFocusedWindowIndex = getLastFocusedWindowIndex() {
-            updateFocusedWindowIndex(lastFocusedWindowIndex)
+            updateHoveredAndFocusedWindowIndexes(lastFocusedWindowIndex)
         } else {
             cycleFocusedWindowIndex(1)
             if focusedWindowIndex == 0 {
-                updateFocusedWindowIndex(0)
+                updateHoveredAndFocusedWindowIndexes(0)
             }
         }
     }
@@ -99,22 +99,23 @@ class Windows {
         return nil
     }
 
-    static func updateFocusedWindowIndex(_ newIndex: Int, _ fromMouse: Bool = false) {
-        if (fromMouse && newIndex == hoveredWindowIndex) || (!fromMouse && newIndex == focusedWindowIndex) {
-            return
-        }
-        if fromMouse {
+    static func updateHoveredAndFocusedWindowIndexes(_ newIndex: Int, _ fromMouse: Bool = false) {
+        var index: Int?
+        if fromMouse && newIndex != hoveredWindowIndex {
             let oldIndex = hoveredWindowIndex
             hoveredWindowIndex = newIndex
             if let oldIndex = oldIndex {
                 ThumbnailsView.highlight(oldIndex)
             }
-        } else {
+            index = hoveredWindowIndex
+        }
+        if (!fromMouse || Preferences.mouseHoverEnabled) && newIndex != focusedWindowIndex {
             let oldIndex = focusedWindowIndex
             focusedWindowIndex = newIndex
             ThumbnailsView.highlight(oldIndex)
+            index = focusedWindowIndex
         }
-        let index = fromMouse ? hoveredWindowIndex! : focusedWindowIndex
+        guard let index = index else { return }
         ThumbnailsView.highlight(index)
         let focusedView = ThumbnailsView.recycledViews[index]
         App.app.thumbnailsPanel.thumbnailsView.scrollView.contentView.scrollToVisible(focusedView.frame)
@@ -143,7 +144,7 @@ class Windows {
                (KeyRepeatTimer.isARepeat || KeyRepeatTimer.timer?.isValid ?? false) {
             return
         }
-        updateFocusedWindowIndex(nextIndex)
+        updateHoveredAndFocusedWindowIndexes(nextIndex)
     }
 
     static func windowIndexAfterCycling(_ step: Int) -> Int {

src/ui/main-window/ThumbnailView.swift

@@ -186,7 +186,7 @@ class ThumbnailView: NSStackView {
             windowlessIcon.needsDisplay = true
         }
         self.mouseUpCallback = { () -> Void in App.app.focusSelectedWindow(element) }
-        self.mouseMovedCallback = { () -> Void in Windows.updateFocusedWindowIndex(index, true) }
+        self.mouseMovedCallback = { () -> Void in Windows.updateHoveredAndFocusedWindowIndexes(index, true) }
         [quitIcon, closeIcon, minimizeIcon, maximizeIcon].forEach { $0.window_ = element }
         showOrHideWindowControls(false)
         // force a display to avoid flickering; see https://github.com/lwouis/alt-tab-macos/issues/197
@@ -263,9 +263,7 @@ class ThumbnailView: NSStackView {
 
     func mouseMoved() {
         showOrHideWindowControls(true)
-        if Preferences.mouseHoverEnabled {
-            mouseMovedCallback()
-        }
+        mouseMovedCallback()
     }
 
     override func mouseUp(with event: NSEvent) {

src/ui/main-window/ThumbnailsView.swift

@@ -71,7 +71,7 @@ class ThumbnailsView: NSVisualEffectView {
                 return leadingSide ? NSMinX($0.frame) < originCenter : NSMaxX($0.frame) > originCenter
             } ?? iterable.last!
             let targetIndex = ThumbnailsView.recycledViews.firstIndex(of: targetView)!
-            Windows.updateFocusedWindowIndex(targetIndex)
+            Windows.updateHoveredAndFocusedWindowIndexes(targetIndex)
         }
     }
 
@@ -228,6 +228,14 @@ class ScrollView: NSScrollView {
             self?.isCurrentlyScrolling = true
         }
     }
+    
+    private func resetHoveredWindow() {
+        if let oldIndex = Windows.hoveredWindowIndex {
+            Windows.hoveredWindowIndex = nil
+            ThumbnailsView.highlight(oldIndex)
+            ThumbnailsView.recycledViews[oldIndex].showOrHideWindowControls(false)
+        }
+    }
 
     override func mouseMoved(with event: NSEvent) {
         // disable mouse hover during scrolling as it creates jank during elastic bounces at the start/end of the scrollview
@@ -245,19 +253,15 @@ class ScrollView: NSScrollView {
                 let target = target as! ThumbnailView
                 target.mouseMoved()
             } else {
-                previousTarget?.showOrHideWindowControls(false)
+                resetHoveredWindow()
             }
         } else {
-            previousTarget?.showOrHideWindowControls(false)
+            resetHoveredWindow()
         }
     }
 
     override func mouseExited(with event: NSEvent) {
-        if let oldIndex = Windows.hoveredWindowIndex {
-            Windows.hoveredWindowIndex = nil
-            ThumbnailsView.highlight(oldIndex)
-            ThumbnailsView.recycledViews[oldIndex].showOrHideWindowControls(false)
-        }
+        resetHoveredWindow()
     }
 
     /// holding shift and using the scrolling wheel will generate a horizontal movement