editor does not remember vertical splitter position

### Bug description

It may be useful to create a pixel perfect screenshots with different themes (for example for light and dark ones).
Or it may just save time for the user.

https://github.com/deep-foundation/deepcase/assets/1431904/4bf22c6e-20c6-419a-87da-32ab012a3417

### Expected Behavior

Splitter will remain in place for SyncTextFile or TSX file or any other link with string value.

### Current Behavior

Splitter resets to middle of the screen.

### Steps to reproduce

1. Open any TSX link in editor.

### Workaround

Move splitter again (each time editor is opened).

### Environment

_No response_