SegmentedVC: Notify its child on viewWillAppear/viewDidAppear.

This fixes the room selection in master when playing when doing screen rotation with the splitVC.

Vector/ViewController/HomeViewController.m

@@ -205,14 +205,6 @@
     }
 }
 
-- (void)viewWillDisappear:(BOOL)animated
-{
-    [super viewWillDisappear:animated];
-
-    _selectedRoomId = nil;
-    _selectedRoomSession = nil;
-}
-
 - (void) viewDidLayoutSubviews
 {
     [super viewDidLayoutSubviews];

Vector/ViewController/SegmentedViewController.m

@@ -143,6 +143,18 @@
     [self createSegmentedViews];
 }
 
+- (void)viewWillAppear:(BOOL)animated
+{
+    [super viewWillAppear:animated];
+
+    if (_selectedViewController)
+    {
+        // Make iOS invoke child viewWillAppear and viewDidAppear
+        [_selectedViewController beginAppearanceTransition:YES animated:animated];
+        [_selectedViewController endAppearanceTransition];
+    }
+}
+
 - (void)createSegmentedViews
 {
     NSMutableArray* labels = [[NSMutableArray alloc] init];