fix selection

Author: juliankrispel

src/modifiers/changeCurrentBlockType.js

@@ -7,16 +7,27 @@ const changeCurrentBlockType = (
   blockMetadata = {}
 ) => {
   const currentContent = editorState.getCurrentContent();
-  const selection = editorState.getSelection();
+  let selection = editorState.getSelection();
   const key = selection.getStartKey();
   const blockMap = currentContent.getBlockMap();
   const block = blockMap.get(key);
   const data = block.getData().merge(blockMetadata);
   const newBlock = block.merge({ type, data, text: text });
+
+  const lastOffset = text.length;
+
+  if (selection.getFocusOffset() > lastOffset) {
+    selection = selection.merge({
+      anchorOffset: lastOffset,
+      focusOffset: lastOffset,
+    });
+  }
+
   const newContentState = currentContent.merge({
     blockMap: blockMap.set(key, newBlock),
     selectionAfter: selection,
   });
+
   return EditorState.push(editorState, newContentState, "change-block-type");
 };