Use --first-parent for log with --follow

Removes bogus merge commits that can show up in the history

src/git/git.ts

@@ -804,7 +804,7 @@ export namespace Git {
 			params.push(`--diff-filter=${filters.join(emptyStr)}`);
 		}
 
-		if (firstParent) {
+		if ((all !== true && renames) || firstParent) {
 			params.push('--first-parent');
 		}