Add a "splash screen" (show window immediately and seamlessly display browser when ready)

Closes #114

Core/FormBrowser.Designer.cs

@@ -32,6 +32,7 @@ private void InitializeComponent() {
             // 
             this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
+            this.BackColor = TweetDck.Core.Utils.BrowserUtils.BackgroundColor;
             this.ClientSize = new System.Drawing.Size(324, 386);
             this.Icon = Properties.Resources.icon;
             this.Location = TweetDck.Core.Controls.ControlExtensions.InvisibleLocation;

Core/FormBrowser.cs

@@ -83,7 +83,10 @@ public FormBrowser(PluginManager pluginManager, UpdaterSettings updaterSettings)
             this.browser.LoadError += browser_LoadError;
             this.browser.RegisterAsyncJsObject("$TD", new TweetDeckBridge(this, notification));
             this.browser.RegisterAsyncJsObject("$TDP", plugins.Bridge);
-
+            
+            browser.BrowserSettings.BackgroundColor = (uint)BrowserUtils.BackgroundColor.ToArgb();
+            browser.Dock = DockStyle.None;
+            browser.Location = ControlExtensions.InvisibleLocation;
             Controls.Add(browser);
 
             Controls.Add(new MenuStrip{ Visible = false }); // fixes Alt freezing the program in Win 10 Anniversary Update
@@ -112,6 +115,8 @@ public FormBrowser(PluginManager pluginManager, UpdaterSettings updaterSettings)
             this.updates = new UpdateHandler(browser, this, updaterSettings);
             this.updates.UpdateAccepted += updates_UpdateAccepted;
             this.updates.UpdateDismissed += updates_UpdateDismissed;
+
+            RestoreWindow();
         }
 
         private void ShowChildForm(Form form){
@@ -126,10 +131,17 @@ public void ForceClose(){
 
         // window setup
 
-        private void SetupWindow(){
+        private void RestoreWindow(){
             Config.BrowserWindow.Restore(this, true);
             prevState = WindowState;
-            isLoaded = true;
+        }
+
+        private void OnLoaded(){
+            if (!isLoaded){
+                browser.Location = Point.Empty;
+                browser.Dock = DockStyle.Fill;
+                isLoaded = true;
+            }
         }
 
         private void UpdateTrayIcon(){
@@ -144,13 +156,15 @@ private void browser_LoadingStateChanged(object sender, LoadingStateChangedEvent
                     browser.AddWordToDictionary(word);
                 }
 
-                BeginInvoke(new Action(SetupWindow));
+                BeginInvoke(new Action(OnLoaded));
                 browser.LoadingStateChanged -= browser_LoadingStateChanged;
             }
         }
 
         private void browser_FrameLoadEnd(object sender, FrameLoadEndEventArgs e){
             if (e.Frame.IsMain && BrowserUtils.IsTweetDeckWebsite(e.Frame)){
+                e.Frame.ExecuteJavaScriptAsync(BrowserUtils.BackgroundColorFix);
+
                 UpdateProperties();
                 ScriptLoader.ExecuteFile(e.Frame, "code.js");
                 ReinjectCustomCSS(Config.CustomBrowserCSS);
@@ -229,9 +243,8 @@ private void Config_TrayBehaviorChanged(object sender, EventArgs e){
         }
 
         private void trayIcon_ClickRestore(object sender, EventArgs e){
-            isLoaded = false;
             Show();
-            SetupWindow();
+            RestoreWindow();
             Activate();
             UpdateTrayIcon();
         }

Core/Utils/BrowserUtils.cs

@@ -6,6 +6,7 @@
 using System.Windows.Forms;
 using CefSharp;
 using System.Text.RegularExpressions;
+using System.Drawing;
 
 namespace TweetDck.Core.Utils{
     static class BrowserUtils{
@@ -28,6 +29,9 @@ public static string HeaderUserAgent{
             }
         }
 
+        public static readonly Color BackgroundColor = Color.FromArgb(28, 99, 153);
+        public const string BackgroundColorFix = "let e=document.createElement('style');document.head.appendChild(e);e.innerHTML='body::before{background:#1c6399!important}'";
+
         public static readonly string[] DictionaryWords = {
             "tweetdeck", "TweetDeck", "tweetduck", "TweetDuck", "TD"
         };