Side-by-side preview pane rendering with the incorrect height

[RaceProUK]

Describe the bug
When using a maximum height in units other than pixels, the side-by-side preview pane is rendered incorrectly, typically ending up much shorter than it should be.

To Reproduce
Steps to reproduce the behavior:

1. Set maxHeight to a non-pixel value e.g. 40rem
2. Enable side-by-side without fullscreen

Expected behavior
The preview pane should be the same height as the editor pane.

Version information

• OS: Windows
• Browser: Chrome 122
• EasyMDE version: 2.18.0

Additional context
This issue doesn't occur when using fullscreen mode.

The trigger appears to be https://github.com/Ionaru/easy-markdown-editor/blob/master/src/js/easymde.js#L2555, as it's the only place where options.maxHeight is wrapped in parseInt(), causing the unit to be discarded.