cocoa: Only process hit tests on left clicks

Otherwise, right-click events over drag areas will be eaten.

src/video/cocoa/SDL_cocoawindow.m

@@ -1668,11 +1668,6 @@ static void Cocoa_SendMouseButtonClicks(SDL_Mouse *mouse, NSEvent *theEvent, SDL
         }
     }
 
-    if ([self processHitTest:theEvent]) {
-        SDL_SendWindowEvent(_data.window, SDL_EVENT_WINDOW_HIT_TEST, 0, 0);
-        return; // dragging, drop event.
-    }
-
     switch ([theEvent buttonNumber]) {
     case 0:
         if (([theEvent modifierFlags] & NSEventModifierFlagControl) &&
@@ -1695,6 +1690,11 @@ static void Cocoa_SendMouseButtonClicks(SDL_Mouse *mouse, NSEvent *theEvent, SDL
         break;
     }
 
+    if (button == SDL_BUTTON_LEFT && [self processHitTest:theEvent]) {
+        SDL_SendWindowEvent(_data.window, SDL_EVENT_WINDOW_HIT_TEST, 0, 0);
+        return; // dragging, drop event.
+    }
+
     Cocoa_SendMouseButtonClicks(mouse, theEvent, _data.window, button, true);
 }
 
@@ -1721,11 +1721,6 @@ static void Cocoa_SendMouseButtonClicks(SDL_Mouse *mouse, NSEvent *theEvent, SDL
         return;
     }
 
-    if ([self processHitTest:theEvent]) {
-        SDL_SendWindowEvent(_data.window, SDL_EVENT_WINDOW_HIT_TEST, 0, 0);
-        return; // stopped dragging, drop event.
-    }
-
     switch ([theEvent buttonNumber]) {
     case 0:
         if (wasCtrlLeft) {
@@ -1746,6 +1741,11 @@ static void Cocoa_SendMouseButtonClicks(SDL_Mouse *mouse, NSEvent *theEvent, SDL
         break;
     }
 
+    if (button == SDL_BUTTON_LEFT && [self processHitTest:theEvent]) {
+        SDL_SendWindowEvent(_data.window, SDL_EVENT_WINDOW_HIT_TEST, 0, 0);
+        return; // stopped dragging, drop event.
+    }
+
     Cocoa_SendMouseButtonClicks(mouse, theEvent, _data.window, button, false);
 }