Feature request: Resize multiple windows at once (and snap to window) without tiling

[bala7s]

When I have - for example - two windows side by side, I can only resiye them one by one. The problem is that when I make one window narrower, I can't resize the other one to be exactly as big as the remaining space by either resizing the two windows at one (like in macOS) or by snapping the window to the other one, like in Ubuntu for example.