Fix changing the current block type

Author: mxstbr

src/modifiers/changeCurrentBlockType.js

@@ -12,14 +12,10 @@ const changeCurrentBlockType = (
   const blockMap = currentContent.getBlockMap();
   const block = blockMap.get(key);
   const data = block.getData().merge(blockMetadata);
-  const newBlock = block.merge({ type, data, text: text || "" });
-  const newSelection = selection.merge({
-    anchorOffset: 0,
-    focusOffset: 0,
-  });
+  const newBlock = block.merge({ type, data, text: text });
   const newContentState = currentContent.merge({
     blockMap: blockMap.set(key, newBlock),
-    selectionAfter: newSelection,
+    selectionAfter: selection,
   });
   return EditorState.push(editorState, newContentState, "change-block-type");
 };