I'm a long time tmux fan, but I've been dealing with odd issues related to mouse actions. This is somewhere in alacritty, *vim or tmux. So I futzed with all of them, tried different terminals, all while telling myself it couldn't be tmux. So I just ignored it for over a year. I finally went back and gave wezterm a serious try just a few weeks ago and I am very happy to have switched. The mouse issues I was seeing go away. Splitting panes and resizing lots of panes is fast and responsive. It's built in so copying from a vertical split pane doesn't include the other pane like in tmux.
That doesn't make it perfect. Mouse themes are applied inconsistently as I use Gnome on Wayland. It also seems to be a problem when using neovim, but I can't prove it clearly enough to want to file a bug with anyone. Besides, everything I need to do still works and I rarely use the mouse unless I am copying random gobs of text.
I am sticking with wezterm for the moment. I have no reason to leave it at this point and it helped me reduce the complexity of my stack a teeny bit.
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