Liquid Glass App Icon for macOS 26 Tahoe (#1659)

* Added new Liquid Glass app icon

Design based on the existing app icon created by Giovanni Maria Cusaro.

* Use legacy app icon for older macOS versions

Added build setting to use legacy app icon for pre macOS Tahoe builds.

* Added Liquid Glass app icon contribution

Author: alexkaessner

README.md

@@ -187,6 +187,6 @@ The original repository for MASShortcut was archived, so Rectangle uses my [fork
 
 As mentioned above, Rectangle uses a forked version of [MASShortcut](https://github.com/rxhanson/MASShortcut), which still works great, and it uses [Sparkle](https://sparkle-project.org) for updates. 
 
-The Big Sur variant of the Rectangle app icon was created by Giovanni Maria Cusaro (@gmcusaro).
+The Big Sur variant of the Rectangle app icon was created by Giovanni Maria Cusaro (@gmcusaro). The Liquid Glass variant of the app icon was created by [Alexander Käßner](https://www.alexkaessner.de) (@alexkaessner).
 
 And of course, there's been a lot of community contributions over the years :)

Rectangle.xcodeproj/project.pbxproj

@@ -9,6 +9,7 @@
 /* Begin PBXBuildFile section */
 		12D896200936C0DE9FF41FB4 /* (null) in Frameworks */ = {isa = PBXBuildFile; };
 		30166BD024F27D6A00A38608 /* SpecifiedCalculation.swift in Sources */ = {isa = PBXBuildFile; fileRef = 30166BCF24F27D6A00A38608 /* SpecifiedCalculation.swift */; };
+		482E9E422EB1528D00D7928A /* AppIcon.icon in Resources */ = {isa = PBXBuildFile; fileRef = 482E9E412EB1528D00D7928A /* AppIcon.icon */; };
 		6490B39127BF907A0056C220 /* BottomLeftEighthCalculation.swift in Sources */ = {isa = PBXBuildFile; fileRef = 6490B39027BF907A0056C220 /* BottomLeftEighthCalculation.swift */; };
 		6490B39327BF90F90056C220 /* EighthsRepeated.swift in Sources */ = {isa = PBXBuildFile; fileRef = 6490B39227BF90F90056C220 /* EighthsRepeated.swift */; };
 		6490B39527BF96880056C220 /* TopLeftEighthCalculation.swift in Sources */ = {isa = PBXBuildFile; fileRef = 6490B39427BF96880056C220 /* TopLeftEighthCalculation.swift */; };
@@ -179,6 +180,7 @@
 		30166BCF24F27D6A00A38608 /* SpecifiedCalculation.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SpecifiedCalculation.swift; sourceTree = "<group>"; };
 		423DC1992AE681F900C98564 /* mul */ = {isa = PBXFileReference; lastKnownFileType = text.json.xcstrings; name = mul; path = mul.lproj/Main.xcstrings; sourceTree = "<group>"; };
 		42627A972ADA03D200D047C6 /* mul */ = {isa = PBXFileReference; lastKnownFileType = text.json.xcstrings; name = mul; path = mul.lproj/Main.xcstrings; sourceTree = "<group>"; };
+		482E9E412EB1528D00D7928A /* AppIcon.icon */ = {isa = PBXFileReference; lastKnownFileType = folder.iconcomposer.icon; path = AppIcon.icon; sourceTree = "<group>"; };
 		6490B39027BF907A0056C220 /* BottomLeftEighthCalculation.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BottomLeftEighthCalculation.swift; sourceTree = "<group>"; };
 		6490B39227BF90F90056C220 /* EighthsRepeated.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = EighthsRepeated.swift; sourceTree = "<group>"; };
 		6490B39427BF96880056C220 /* TopLeftEighthCalculation.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TopLeftEighthCalculation.swift; sourceTree = "<group>"; };
@@ -551,6 +553,7 @@
 			children = (
 				9824700C22AF9B7D0037B409 /* AppDelegate.swift */,
 				9824701022AF9B7E0037B409 /* Assets.xcassets */,
+				482E9E412EB1528D00D7928A /* AppIcon.icon */,
 				9824701222AF9B7E0037B409 /* Main.storyboard */,
 				9824701522AF9B7E0037B409 /* Info.plist */,
 				981F27D02340E3E1006CD263 /* InternetAccessPolicy.plist */,
@@ -824,6 +827,7 @@
 				9824701422AF9B7E0037B409 /* Main.storyboard in Resources */,
 				981F27D12340E3E1006CD263 /* InternetAccessPolicy.plist in Resources */,
 				98987AA42391890400BE72C4 /* LogViewer.storyboard in Resources */,
+				482E9E422EB1528D00D7928A /* AppIcon.icon in Resources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -1208,6 +1212,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				ASSETCATALOG_OTHER_FLAGS = "--enable-icon-stack-fallback-generation=disabled";
 				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_ENTITLEMENTS = Rectangle/Rectangle.entitlements;
 				CODE_SIGN_IDENTITY = "-";
@@ -1238,6 +1243,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				ASSETCATALOG_OTHER_FLAGS = "--enable-icon-stack-fallback-generation=disabled";
 				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_ENTITLEMENTS = Rectangle/RectangleRelease.entitlements;
 				CODE_SIGN_IDENTITY = "Apple Development";

Rectangle/AppIcon.icon/Assets/Dots.svg

@@ -0,0 +1,63 @@
+{
+  "color-space-for-untagged-svg-colors" : "display-p3",
+  "fill" : {
+    "linear-gradient" : [
+      "display-p3:0.36863,0.43529,0.50980,1.00000",
+      "srgb:0.24706,0.27451,0.33333,1.00000"
+    ]
+  },
+  "groups" : [
+    {
+      "blur-material" : null,
+      "layers" : [
+        {
+          "glass" : true,
+          "image-name" : "Dots.svg",
+          "name" : "Dots"
+        }
+      ],
+      "shadow" : {
+        "kind" : "none",
+        "opacity" : 0.5
+      },
+      "specular" : true,
+      "translucency" : {
+        "enabled" : true,
+        "value" : 0.2
+      }
+    },
+    {
+      "layers" : [
+        {
+          "fill-specializations" : [
+            {
+              "appearance" : "tinted",
+              "value" : {
+                "linear-gradient" : [
+                  "gray:0.90000,1.00000",
+                  "extended-gray:0.75000,1.00000"
+                ]
+              }
+            }
+          ],
+          "glass" : true,
+          "image-name" : "Overlay.svg",
+          "name" : "Overlay"
+        }
+      ],
+      "shadow" : {
+        "kind" : "layer-color",
+        "opacity" : 0.5
+      },
+      "translucency" : {
+        "enabled" : true,
+        "value" : 0.5
+      }
+    }
+  ],
+  "supported-platforms" : {
+    "squares" : [
+      "macOS"
+    ]
+  }
+}