numeric
The state of panel interaction within panel_window. When the "value" of a panel of panel_window is changed via user-interaction, the panel.changed element of the panel is set to 1, and the panel_window.changed element is set to 1.
In effect this tells you whether any panels have changed since the last time you looked.
For new windows, this element has a value of 0.
The window procedures .reset() and .undo() use this element to monitor changes and default panel states.
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