Android: suppress deprecation warning for safe area APIs before Android R

We already handle both cases of pre and post Android R APIs, so  we can
safely suppress the code using older API after extracting it to its own
method.

Change-Id: I3f5d6dab480c5fb32d35f615db719a4a0eb3f45d
Reviewed-by: Petri Virkkunen <petri.virkkunen@qt.io>

src/android/jar/src/org/qtproject/qt/android/QtWindow.java

@@ -83,6 +83,19 @@ class QtWindow extends QtLayout implements QtSurfaceInterface {
                     int types = WindowInsets.Type.displayCutout() | WindowInsets.Type.systemBars();
                     safeInsets = insets.getInsets(types);
                 } else {
+                    safeInsets = getSafeInsetsPreAndroidR(view, insets);
+                }
+                QtNative.runAction(() -> safeAreaMarginsChanged(safeInsets, getId()));
+                return insets;
+            });
+
+            QtNative.runAction(() -> requestApplyInsets());
+        }
+    }
+
+    @SuppressWarnings("deprecation")
+    Insets getSafeInsetsPreAndroidR(View view, WindowInsets insets)
+    {
         int left = 0;
         int top = 0;
         int right = 0;
@@ -106,16 +119,7 @@ class QtWindow extends QtLayout implements QtSurfaceInterface {
             bottom = Math.max(bottom, cutout.getSafeInsetBottom());
         }
 
-                    safeInsets = Insets.of(left, top, right, bottom);
+        return Insets.of(left, top, right, bottom);
-                }
-
-                QtNative.runAction(() -> safeAreaMarginsChanged(safeInsets, getId()));
-
-                return insets;
-            });
-
-            QtNative.runAction(() -> requestApplyInsets());
-        }
     }
 
     @UsedFromNativeCode