There's a new core plugin called "Note Composer" that can help you merge and split notes quickly.
New command and menu option are available for merging current note into another one.
Select text and right click for the option to extract it into a separate note.
You can choose to apply a template for extracted notes. The extracted text will be filled into the {{content}} variable in the template. Other variables like {{fromTitle}}, {{newTitle}}, {{date:YYYY-MM-DD}} are also available.
Improvements
Core plugins now has their commands prefixed with their plugin name, which makes them easier to find in Command Palette.
The right click menu in edit mode is now unified into a single consistent menu, which contains the cut/copy/paste/select all options, spellcheck suggestions, as well as link options if available.
No longer broken
Syntax highlighting will now properly recognize any character for task lists.
Pasting images from Chrome now properly works to import it on MacOS.
Quick switcher now no longer ranks subfolder matches significantly lower than poor file name matches.
Text overflowing modals now properly scroll rather than clip at the edge of the screen.
Plugins causing an error in checkCallback no longer breaks the command palette.
Fixed backlink in document not showing up in an empty file.
Fixed drag-and-drop panes not working when right sidebar has no panes and is completely hidden.
Developers
Fixed data-path not updated when folders are renamed.
There is now a editor-menu event on Workspace, which can be used to add more options to the context menu inside the editor.