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Sway

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Man page:swaymsg

Get tree ​

Gets a JSON-encoded layout tree of everything open.

If there is "shell": "xwayland", some app is running under Xwayland.

shell
swaymsg -t get_tree | less

Configuration ​

To add a hint [XWayland] to Xwayland window titles, add the following to the configuration file:

shell
for_window [shell="xwayland"] title_format "%title [XWayland]"