android: When rotating, we also need to update the viewport geometry.

Change-Id: I04502c56b1e1d16cf65cbeb47632c508ef9889d0

android/experimental/LOAndroid3/src/java/org/libreoffice/LOKitThread.java

@@ -45,20 +45,32 @@ public class LOKitThread extends Thread {
         return true;
     }
 
-    private void refresh() {
-        Bitmap bitmap = mTileProvider.thumbnail(1000);
-        if (bitmap != null) {
-            mApplication.getLayerController().getView().changeCheckerboardBitmap(bitmap, mTileProvider.getPageWidth(), mTileProvider.getPageHeight());
+    /** Handle the geometry change + draw. */
+    private void redraw() {
+        if (mController == null || mTileProvider == null) {
+            // called too early...
+            return;
         }
 
-        mLayerClient.clearAndResetlayers();
         draw();
+
         RectF rect = new RectF(0, 0, mTileProvider.getPageWidth(), mTileProvider.getPageHeight());
         mController.setPageRect(rect, rect);
         mController.setViewportMetrics(mController.getViewportMetrics());
         mController.setForceRedraw();
     }
 
+    /** Invalidate everything + handle the geometry change + draw. */
+    private void refresh() {
+        Bitmap bitmap = mTileProvider.thumbnail(1000);
+        if (bitmap != null) {
+            mApplication.getLayerController().getView().changeCheckerboardBitmap(bitmap, mTileProvider.getPageWidth(), mTileProvider.getPageHeight());
+        }
+
+        mLayerClient.clearAndResetlayers();
+        redraw();
+    }
+
     private void changePart(int partIndex) {
         LOKitShell.showProgressSpinner();
         mTileProvider.changePart(partIndex);
@@ -119,8 +131,7 @@ public class LOKitThread extends Thread {
                 draw();
                 break;
             case LOEvent.SIZE_CHANGED:
-                // re-draw when the size has changed
-                draw();
+                redraw();
                 break;
             case LOEvent.CHANGE_PART:
                 changePart(event.getPartIndex());