Made it so that tabbing to the timeline selects something. Issue #558.

NetNewsWire/MainWindow/Sidebar/Keyboard/SidebarKeyboardShortcuts.plist

@@ -2,6 +2,12 @@
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
 <array>
+	<dict>
+		<key>key</key>
+		<string>[tab]</string>
+		<key>action</key>
+		<string>navigateToTimeline:</string>
+	</dict>
 	<dict>
 		<key>key</key>
 		<string>,</string>

NetNewsWire/MainWindow/Timeline/TimelineTableView.swift

@@ -20,16 +20,6 @@ class TimelineTableView: NSTableView {
 		}
 		super.keyDown(with: event)
 	}
-	
-//	override func becomeFirstResponder() -> Bool {
-//		if super.becomeFirstResponder() {
-//			if selectedRow == -1 && numberOfRows > 0 {
-//				rs_selectRowAndScrollToVisible(0)
-//			}
-//			return true
-//		}
-//		return false
-//	}
 
 	// MARK: - NSView
 

NetNewsWire/MainWindow/Timeline/TimelineViewController.swift

@@ -375,6 +375,9 @@ final class TimelineViewController: NSViewController, UndoableCommandRunner {
 		}
 		
 		window.makeFirstResponderUnlessDescendantIsFirstResponder(tableView)
+		if !hasAtLeastOneSelectedArticle && articles.count > 0 {
+			tableView.rs_selectRowAndScrollToVisible(0)
+		}
 	}
 
 	// MARK: - Notifications