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Assets/Plugins/Fullscreen/Editor/Linux/NativeFullscreenHook.cs

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+using UnityEditor;
+
+namespace FullscreenEditor.Linux {
+    internal static class NativeFullscreenHooks {
+
+        [InitializeOnLoadMethod]
+        private static void Init() {
+            if (!FullscreenUtility.IsLinux)
+                return;
+
+            FullscreenCallbacks.afterFullscreenOpen += (fs) => {
+                if (wmctrl.IsInstalled && !FullscreenPreferences.DoNotUseWmctrl.Value)
+                    wmctrl.SetNativeFullscreen(true, fs.m_dst.Container);
+            };
+            FullscreenCallbacks.beforeFullscreenClose += (fs) => {
+                if (wmctrl.IsInstalled && !FullscreenPreferences.DoNotUseWmctrl.Value)
+                    wmctrl.SetNativeFullscreen(false, fs.m_dst.Container);
+            };
+        }
+
+    }
+}

Assets/Plugins/Fullscreen/Editor/Linux/wmctrl.cs

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+using System;
+using UnityEditor;
+using UnityEngine;
+
+namespace FullscreenEditor.Linux {
+    /// <summary>wmctrl is a tool to interact with an X Window manager available on Linux platforms.</summary>
+    public static class wmctrl {
+
+        static wmctrl() {
+            try {
+                var stdout = string.Empty;
+                var stderr = string.Empty;
+                var exitCode = Cmd.Run("which wmctrl", false, out stdout, out stderr);
+
+                IsInstalled = exitCode == 0;
+            } catch (Exception e) {
+                Logger.Debug("Could not run command 'which wmctrl': {0}", e);
+                IsInstalled = false;
+            }
+        }
+
+        public static readonly bool IsInstalled;
+
+        private static string Run(string format, params object[] args) {
+            if (!FullscreenUtility.IsLinux)
+                throw new PlatformNotSupportedException("wmctrl is only available on Linux based platforms");
+
+            if (FullscreenPreferences.DoNotUseWmctrl.Value) {
+                Logger.Debug("wmctrl being invoked while DoNotUseWmctrl is enabled");
+            }
+
+            var result = Cmd.Run("wmctrl " + format, args);
+            Logger.Debug("wmctrl exited with stdio: {0}", result);
+            return result;
+        }
+
+        /// <summary>Enable or disable native fullscreen for a given window.</summary>
+        /// <param name="fullscreen">Should the window be fullscreen or not.</param>
+        /// <param name="window">The window to changed. If null the active window will be fullscreened.</param>
+        public static void SetNativeFullscreen(bool fullscreen, EditorWindow window) {
+            if (window)
+                window.Focus();
+
+            Run("-r ':ACTIVE:' -b {0},fullscreen", fullscreen ? "add" : "remove");
+        }
+
+        /// <summary>Enable or disable native fullscreen for a given view.</summary>
+        /// <param name="fullscreen">Should the view be fullscreen or not.</param>
+        /// <param name="view">The view to changed. If null the active view will be fullscreened.</param>
+        public static void SetNativeFullscreen(bool fullscreen, ScriptableObject view) {
+            if (view)
+                FullscreenUtility.FocusView(view);
+
+            Run("-r ':ACTIVE:' -b {0},fullscreen", fullscreen ? "add" : "remove");
+        }
+
+        /// <summary>Toggles native fullscreen for a given window.</summary>
+        /// <param name="window">The window to be toggled fullscreen.</param>
+        public static void ToggleNativeFullscreen(EditorWindow window) {
+            if (window)
+                window.Focus();
+
+            Run("-r ':ACTIVE:' -b toggle,fullscreen");
+        }
+
+        /// <summary>Toggles native fullscreen for a given view.</summary>
+        /// <param name="view">The view to be toggled fullscreen.</param>
+        public static void ToggleNativeFullscreen(ScriptableObject view) {
+            if (view)
+                FullscreenUtility.FocusView(view);
+
+            Run("-r ':ACTIVE:' -b toggle,fullscreen");
+        }
+    }
+}