Fixes tracker on startup

Resolves chcken/egg issue with tracker and git service

CHANGELOG.md

@@ -7,6 +7,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/) and this p
 ## [Unreleased]
 ### Fixed
 - Fixes [#247](https://github.com/eamodio/vscode-gitlens/issues/247) - File annotations button or ESC key does not turn off file annotations
+- Fixes issue where sometimes blame context wasn't available for the open editor when starting vscode
 
 ## [7.5.4] - 2018-01-17
 ### Fixed

src/container.ts

@@ -19,6 +19,10 @@ export class Container {
 
         context.subscriptions.push(Container._tracker = new DocumentTracker<GitDocumentState>());
         context.subscriptions.push(Container._git = new GitService());
+
+        // Since there is a chicken/egg problem with the DocumentTracker and the GitService, initialize the tracker once the GitService is loaded
+        Container._tracker.initialize();
+
         context.subscriptions.push(Container._annotationController = new AnnotationController());
         context.subscriptions.push(Container._currentLineController = new CurrentLineController());
         context.subscriptions.push(Container._codeLensController = new CodeLensController());

src/trackers/documentTracker.ts

@@ -63,6 +63,10 @@ export class DocumentTracker extends Disposable {
         this.clear();
     }
 
+    initialize() {
+        this.onActiveTextEditorChanged(window.activeTextEditor);
+    }
+
     private onConfigurationChanged(e: ConfigurationChangeEvent) {
         const initializing = configuration.initializing(e);