Fixes #496 - matches git's default abbrev sha length

CHANGELOG.md

@@ -23,6 +23,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/) and this p
 
 ### Fixed
 
+- Fixes [#496](https://github.com/eamodio/vscode-gitlens/issues/496) - Short hash length doesn't match git's default length
 - Fixes [#503](https://github.com/eamodio/vscode-gitlens/issues/503) - Open Changes (with difftool) opens one difftool window per changed file
 - Fixes [#405](https://github.com/eamodio/vscode-gitlens/issues/405) - Secondary, blank repository appears repeatedly in gitExplorer view
 - Fixes [#430](https://github.com/eamodio/vscode-gitlens/issues/430) - File revisions can end up being parsed by language servers (causing errors and warnings, etc)

src/git/git.ts

@@ -227,12 +227,12 @@ export class Git {
         }
 
         const index = ref.indexOf('^');
-        if (index > 6) {
+        if (index > 5) {
             // Only grab a max of 5 chars for the suffix
             const suffix = ref.substring(index).substring(0, 5);
-            return `${ref.substring(0, 8 - suffix.length)}${suffix}`;
+            return `${ref.substring(0, 7 - suffix.length)}${suffix}`;
         }
-        return ref.substring(0, 8);
+        return ref.substring(0, 7);
     }
 
     static splitPath(fileName: string, repoPath: string | undefined, extract: boolean = true): [string, string] {