Switches to the previous document.
Switches to the previous open EmEditor document. The behavior of this command depends on whether the Switch to Last Used Window for Next Document Command check box is checked. If it is checked, this command will switch to the earliest used window. If not checked, this command will switch to the previous window displayed on the tab bar.
editor.ExecuteCommandByID(4246);
editor.ExecuteCommandByID 4246
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