Is it possible to add support for having snapped window edges stick together when resizing one window?  For example, when having two windows side by side, one should be able to resize one window and automatically resize the other window accordingly without also having to select the other window and resize it manually.

This would be incredibly helpful in terms of user experience, even though it sounds very simple. It's a standard feature in Windows, macOS and other major desktop environments (e.g. GNOME) for good reasons.

I'm surprised it's not possible to configure this in KDE without kwin scripts, which are unfortunately very buggy when it comes to this functionality.

An example script is 'Sticky Window Snapping':

https://store.kde.org/p/1112552/