Fixes SLKKeyboard notifications not being fired accordantly

Fixes slackhq#290

Author: Ignacio Romero Zurbuchen

Source/SLKTextViewController.m

@@ -1328,14 +1328,13 @@ - (void)slk_willShowOrHideKeyboard:(NSNotification *)notification
         }
     }
 
-    NSInteger curve = [notification.userInfo[UIKeyboardAnimationCurveUserInfoKey] integerValue];
-    NSTimeInterval duration = [notification.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
-    
-    CGRect beginFrame = [notification.userInfo[UIKeyboardFrameBeginUserInfoKey] CGRectValue];
-    CGRect endFrame = [notification.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
-    
     SLKKeyboardStatus status = [self slk_keyboardStatusForNotification:notification];
 
+    // Skips if it's the current status
+    if (self.keyboardStatus == status) {
+        return;
+    }
+    
     // Programatically stops scrolling before updating the view constraints (to avoid scrolling glitch).
     if (status == SLKKeyboardStatusWillShow) {
         [self.scrollViewProxy slk_stopScrolling];
@@ -1356,6 +1355,12 @@ - (void)slk_willShowOrHideKeyboard:(NSNotification *)notification
         [self slk_postKeyboarStatusNotification:notification];
     }
 
+    NSInteger curve = [notification.userInfo[UIKeyboardAnimationCurveUserInfoKey] integerValue];
+    NSTimeInterval duration = [notification.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
+    
+    CGRect beginFrame = [notification.userInfo[UIKeyboardFrameBeginUserInfoKey] CGRectValue];
+    CGRect endFrame = [notification.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
+    
     void (^animations)() = ^void() {
         [self slk_scrollToBottomIfNeeded];
     };
@@ -1395,7 +1400,8 @@ - (void)slk_didShowOrHideKeyboard:(NSNotification *)notification
 
     SLKKeyboardStatus status = [self slk_keyboardStatusForNotification:notification];
 
-    if (status == SLKKeyboardStatusDidHide) {
+    // Skips if it's the current status
+    if (self.keyboardStatus == status) {
         return;
     }