Update FileThumbnailView's grid upon finishing loading thumbnails

Signed-off-by: Alexander Golubev <fatzer2@gmail.com>
(cherry picked from commit eed7134d32)

src/gvcore/filethumbnailview.cpp

@@ -389,6 +389,9 @@ void FileThumbnailView::stopThumbnailUpdate() {
 	if (!d->mThumbnailLoadJob.isNull()) {
 		d->mThumbnailLoadJob->kill(false);
 		d->mThumbnailLoadJob=nullptr;
+		// The job loads image dimensions and this may add extra line to the descriptions, which
+		// may mess up the grid, even if the job is canceled, some items may be already updated.
+		arrangeItemsInGrid();
 	}
 }
 
@@ -399,6 +402,8 @@ void FileThumbnailView::slotUpdateEnded() {
 	d->mProgressWidget=0L;
 
 	BusyLevelManager::instance()->setBusyLevel( this, BUSY_NONE );
+	// Besides thumbnails the job loads image dimensions and this may mess up the grid
+	arrangeItemsInGrid();
 }