Using mde.value(newValue) messes up the editor

**Describe the bug**
After updated to the latest version, when ever I use `mde.value(someNewValue)` to change the existing value after initializing the editor, the text jumps down and the caret is in the wrong place and doesn't respond to mouse clicks.

** Version information **
- OS: MacOS
- Browser: Chrome 95
- EasyMDE version: 2.15.0

Reproduce the issue in EasyMDE 2.15.0 by initializing the editor and calling mde.value(newValue) in Chrome on macOS. Trace the value update and caret or scroll behavior, then verify that the editor remains clickable and the caret stays in the expected position after the value changes.

Written by the indexing model from the issue text.