[Feature] Highlight multiple files (Smart Highlighting)

The Smart Highlighting (Notepad++'s name) means THAT WHEN multiple files are opened, and text in ANY file is selected, text in all other files will automatically be highlighted as normal. Notepad++ call it "**Smart Highlighting**".
This is a feature that no other software currently has (VScode, sublime, Notepad3, etc.). This is super useful for multi-file operations ! That's why I've changed a million editors and still use Notepad++.