private void onDeletion() {
      if (myPreventDeletion && (!DotExporter.DUMP_DOTS && !DotExporter.DUMP_ERROR_DOTS)) {
        throw new AssertionError(
          "TextBuffer was garbage collected without being added to another TextBuffer, data loss occurred. See cause for the creation trace",
          myCreationTrace
        );
      }
    }
Recursive reformatting of groups.
If the group's content would take you over the specified preferred line length, then the group is applied.

- This algorithm usually ensures that if a group is applied, then all the group's parents in the tree are also
  applied. This tends to produce a nice structured output with well-placed potential newlines.
- The formatter keeps track of the offset as a result of the reformat at each character in the text buffer, and
  applies them to the bytecode offsets afterwards, so that the line number mappings don't get messed up.
src/org/jetbrains/java/decompiler/util/TextBuffer.java