Fixing Tmux Mouse Issue

Checkout your tmux version if you've been experiencing mouse-related issue in tmux recently. This is the command:

me@machine $  tmux -V

That should show your tmux version. If you're using Tmux version 2.1, your old mouse configuration in .tmux.conf is no longer valid. The following shows the valid .tmux.conf configuration lines for mouse support in Tmux version 2.1:

#Mouse works as expected
set -g mouse on
#setw -g mode-mouse on #tmux version < 2.1
#set -g mouse-select-pane on  #tmux version < 2.1
#set -g mouse-resize-pane on  #tmux version < 2.1
#set -g mouse-select-window on  #tmux version < 2.1

The commented-out lines are from tmux version < 2.1. There is only one mouse setting in Tmux v2.1, that is "mouse". I got my tmux working as before after this change.

Note:
Primary source of information: [SOLVED] Tmux 2.1 new mouse config issues - can't scroll (It helps despite failing to show the use of the new option in tmux.conf).

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