In a long script, it can be useful to view and edit more than one area of your script simultaneously. For this reason, Script Debugger lets you split the script window text area into multiple panes. You can split the text area vertically or horizontally — and you can split each resulting pane vertically or horizontally. Each pane can be scrolled to display a different region of the script.

(But you’d probably never split a window into panes quite as insanely as in this picture!)

• To split a script window or pane vertically, click the vertical split icon () in the vertical scrollbar, or choose Edit > Split Editor Vertically.

• To split a script window or pane horizontally, click the horizontal split icon () in the horizontal scrollbar, or choose Edit > Split Editor Horizontally.

• To resize a pane, drag the divider line between panes.

• To close a pane, click its close icon () at the lower right corner of the pane, or choose Edit > Close Split View.

• To close all panes, Option-click any close icon (), or choose Edit > Close All Split Views.

What should happen when you change a view setting (such as line wrapping or visibility of tab stops) in a split pane? Should other split panes change to match, or should their view settings remain independent? Script Debugger lets you decide. An Editor preference lets you set the base behavior:

• Synchronize split-view appearance. If checked, then when you change a view setting in one split pane, other split panes of the same window will change the same setting to match.

Whichever way you choose, the Option key is a temporary toggle. Hold down the Option key as you change a view setting to make Script Debugger behave the opposite way from the base behavior preference. For example, if Synchronize split-view appearance is not checked, then if you hold down the Option key and change the line wrapping of a split pane (by clicking its wrap icon, or by choosing View > Wrap Lines), all split panes in this window will adopt the new line wrap setting.