Add a copy Gerrit change link button (#75)

* [Feature] Add a copy Gerrit change link button

* Fix README typo

* Update following reviews

---------

Co-authored-by: Ruslan Lekhman <lekhman112@gmail.com>

Author: poupounetjoyeux

README.md

@@ -32,6 +32,6 @@ Use the following pattern to link revision data to Gerrit:
 | 4.0.1 <= v <= 4.0.2 | 2.0.5               |
 | 4.1 <= v            | master-branch       |
 
-## GitExtensions Plugin Template infomration
+## GitExtensions Plugin Template information
 
 The [GitExtensions Plugin Template](https://github.com/gitextensions/gitextensions.plugintemplate) gives additional information about the pluign development.

src/GitExtensions.GerritPlugin/FormGerritChangeSubmitted.Designer.cs

@@ -1,25 +1,65 @@
+using System;
 using System.Windows.Forms;
 using GitCommands;
 using GitUI;
+using GitUI.Properties;
 
 namespace GitExtensions.GerritPlugin
 {
     public partial class FormGerritChangeSubmitted : GitExtensionsForm
     {
-        public FormGerritChangeSubmitted()
+        private string _changeUri;
+        private Timer _btnCopyIconTimer;
+
+        private FormGerritChangeSubmitted()
         {
             InitializeComponent();
             InitializeComplete();
         }
 
-        public static void ShowSubmitted(IWin32Window owner, string change)
+        private void Initialize(string changeUri)
+        {
+            _changeUri = changeUri;
+            _NO_TRANSLATE_TargetLabel.Text = changeUri;
+
+            _btnCopyIconTimer = new Timer
+            {
+                Enabled = false,
+                Interval = 3 * 1000
+            };
+            _btnCopyIconTimer.Tick += OnRefreshCopyButtonIcon;
+        }
+
+        private void OnRefreshCopyButtonIcon(object sender, EventArgs e)
         {
-            var form = new FormGerritChangeSubmitted();
+            Invoke(() => btnCopy.Image = Images.CopyToClipboard);
+        }
 
-            form._NO_TRANSLATE_TargetLabel.Text = change;
-            form._NO_TRANSLATE_TargetLabel.Click += (s, e) => OsShellUtil.OpenUrlInDefaultBrowser(change);
+        public static void ShowSubmitted(IWin32Window owner, string changeUri)
+        {
+            if (owner == null || string.IsNullOrEmpty(changeUri))
+            {
+                return;
+            }
 
+            using var form = new FormGerritChangeSubmitted();
+            form.Initialize(changeUri);
             form.ShowDialog(owner);
         }
+
+        private void OnChangeLinkClicked(object sender, EventArgs e)
+        {
+            OsShellUtil.OpenUrlInDefaultBrowser(_changeUri);
+        }
+
+        private void OnCopyToClipboardClicked(object sender, EventArgs e)
+        {
+            _btnCopyIconTimer.Stop();
+
+            Clipboard.SetText(_changeUri);
+            btnCopy.Image = Images.BisectGood;
+
+            _btnCopyIconTimer.Start();
+        }
     }
 }