fix #49, fix #2. Reveal to the line where the first commit sits on.

src/view/prFileChangesTreeDataProvider.ts

@@ -44,13 +44,7 @@ export class PullRequestFileChangesTreeDataProvider extends vscode.Disposable im
 			return element;
 		}
 
-		if (element.comments && element.comments.length) {
-			element.iconPath = Resource.icons.light.Comment;
-		} else {
-			element.iconPath = Resource.getFileStatusUri(element);
-		}
-		element.resourceUri = element.filePath;
-		return element;
+		return element.getTreeItem();
 	}
 
 	getChildren(element?: FileChangeNode): vscode.ProviderResult<(FileChangeNode | DescriptionNode)[]> {

src/view/treeNodes/fileChangeNode.ts

@@ -9,14 +9,16 @@ import { GitChangeType } from '../../common/file';
 import { Resource } from '../../common/resources';
 import { IPullRequestModel } from '../../github/interface';
 import { TreeNode } from './treeNode';
+import { Comment } from '../../common/comment';
+import { getDiffLineByPosition } from '../../common/diffPositionMapping';
 
 export class FileChangeNode extends TreeNode implements vscode.TreeItem {
 	public iconPath?: string | vscode.Uri | { light: string | vscode.Uri; dark: string | vscode.Uri };
 	public resourceUri: vscode.Uri;
 	public sha: string;
 	public parentSha: string;
 	public command?: vscode.Command;
-	public comments?: any[];
+	public comments?: Comment[];
 	public contextValue: string;
 
 	get letter(): string {
@@ -49,15 +51,6 @@ export class FileChangeNode extends TreeNode implements vscode.TreeItem {
 	) {
 		super();
 		this.contextValue = 'filechange';
-		this.command = {
-			title: 'show diff',
-			command: 'vscode.diff',
-			arguments: [
-				this.parentFilePath,
-				this.filePath,
-				this.fileName
-			]
-		};
 	}
 
 	getTreeItem(): vscode.TreeItem {
@@ -67,6 +60,36 @@ export class FileChangeNode extends TreeNode implements vscode.TreeItem {
 			this.iconPath = Resource.getFileStatusUri(this);
 		}
 		this.resourceUri = this.filePath;
+
+		let opts = {};
+		if (this.comments && this.comments.length) {
+			let sortedActiveComments = this.comments.filter(comment => comment.position).sort((a, b) => {
+				return a.position - b.position;
+			});
+
+			if (sortedActiveComments.length) {
+				let comment = sortedActiveComments[0];
+				let diffLine = getDiffLineByPosition(comment.diff_hunks, comment.position === null ? comment.original_position : comment.position);
+
+				if (diffLine) {
+					opts = {
+						selection: new vscode.Range(diffLine.newLineNumber - 1, 0, diffLine.newLineNumber - 1, 0)
+					};
+				}
+			}
+		}
+
+		this.command = {
+			title: 'show diff',
+			command: 'vscode.diff',
+			arguments: [
+				this.parentFilePath,
+				this.filePath,
+				this.fileName,
+				opts
+			]
+		};
+
 		return this;
 	}