Menu: File > Reload
Default Shortcut Key: Shift+Ctrl+O
Macro function: ReloadFile()
The Reload command can be used to reload the current file from disk, thereby losing any unsaved changes in the file. Because of the potential for losing changes accidentally, a dialog box will appear to confirm your intention to reload.
The most common use for this command is to restart the editing of a file after having made a large number of unwanted changes. The Undo command can be used to step back through the changes made, but its limits can be exhausted if a large number of changes are made. In that case, the Reload command must be used.