Page broken if first headline is hidden

[Sypwn]

If the first headline on a page is hidden, the page layout breaks.

The following page:

<ifauth @restricted_group>
====== Hidden ======
Hidden content.
</ifauth>

====== Public ======
Not hidden content.

displays like this for users not in restricted_group:

Release 2020-07-29 "Hogfather"
Default dokuwiki template

[5p4k]

So I've dug through this, and the problem occurs in the following scenario: the first header of the page is enclosed in a hidden ifauth block.

I will see if I can get this properly fixed or if I need a workaround. In the meanwhile, to prevent page breakage, do not put the first header inside an ifauth block. You can use any other formatting as long as it's not a header.

---

Technical details:

The reason is that when the header is processed by the parser and lexer, it calls Doku_Handler.header. Any header opens a new section, thus setting Doku_Handler.status['section'] = true;. When the parser reaches the second header, the second header sees that a section is open and issues a section_close instruction. It looks like this:

[
	["document_start",[]],
		["plugin",["ifauthex",[1," admin"],1,"<ifauth admin>"]],
		["header",["Hidden",3,16]],
		/* This section is opened by the header above */
		["section_open",[3]],
			["p_open",[]],
				["plugin",["ifauthex",[3,"private"],3,"private"]],
				["cdata",[""]],
			["p_close",[]],
			["plugin",["ifauthex",[4,null],4,"<\/ifauth>"]],
		/* Above: </ifauthex>, below: section_close issued by the following header. */
		["section_close",[]], 
		["header",["Visible",3,51]],
		["section_open",[3]],
			["p_open",[]],
				["cdata",["public"]],
			["p_close",[]],
		["section_close",[]],
	["document_end",[]]
]

for the following page:

<ifauth admin>
==== Hidden ====
private
</ifauth>
==== Visible ====
public

At render time, the html renderer writes a </div> tag in place of the section_close command, but there is no section that has been opened, because that command was hidden. Essentially it's because ifauth can break the page hierarchy.