EiffelStudio editor offers the possibility to indent or unindent selected lines.
The "Indent" command corresponds to the Indent selection entry in the Advanced sub menu of the Edit Menu. It may be called by using the keyboard shortcut "Tab". Its action is to insert a tabulation in front of each selected line.
The "Unindent" command corresponds to the Unindent selection entry in the Advanced sub menu of the Edit Menu. It may be called by using the keyboard shortcut "Shift+Tab". Its action is to remove the tabulation in front of each selected line if there is such a character.
Note: If there is no selection, you may still use the unindent shortcut "Shift+Tab". The command will be applied to the current line.