This function allows a user to select some number of lines and to hide these such that they will not be visible on the screen, or if lines are hidden they will be shown.
Hiding Lines
To hide a set of lines, select the lines you wish to be hidden and invoke the Hide/show selection command from the View tab or by using the shortcut (CTRL+ '-' numeric keypad). When the lines are hidden, a "+" will be displayed in the folding gutter to the left of the edit window. When editing a file that does not have syntax highlighting, the following configuration options must be selected under Advanced -> Settings -> Editor Display -> Code Folding:
Enable show/hide lines and code folding
Enable show/hide lines in non syntax highlighted files
Multiple sections may be hidden at one time. Changes made to the file will update the hidden regions in most cases such that the hidden lines are maintained. In a few instances (file sort for example) this may not be possible and the hidden lines may be offset requiring them to be hidden again.
Clicking on the "+" in the folding gutter beside hidden lines will cause the section no longer to be hidden. This may be re-hidden by using this Hide Lines feature without a selection - in this case, the last set of lines that was hidden and then shown will be hidden again.
This command can be used from within Macros.
Un-Hiding Lines
To display a set of lines that is hidden, click on the "+" in the folding gutter beside the hidden lines, or position to it via some other means and select Hide/show selection in the View tab.
Saving the Hidden Lines
If the user has the configuration option set to Save Bookmarks the hidden line information will also be saved and reloaded when the file is next loaded.