Show changes in Live preview indicates no changes in a brand new page, data loss results
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Description

Enable live preview in Special:Preferences > Editing
Visit new page, click [Create source] to create
Enter lots of text, [Preview] many times
Much later, wonder if you've saved your latest version yet, so click [Show changes]

Result: nothing is displayed, so you assume you've made no changes and quit your browser, and all your work is lost.

Expected result: please please do what regular [Show changes] does and display

  Latest revision       Your text
Line 1: 	    Line 1:
(nothing)           + lots of text
                    + lots more text

so I know that I haven't actually saved the page yet.

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Status	Assigned	Task
Open	None	T41272 Bugs in "Live preview" feature (tracking)
Open	None	T176558 AJAX "Show changes" doesn't work when creating a page: "TypeError: response[0].query.pages[0].revisions is undefined"
Open	None	T109166 Show changes in Live preview indicates no changes in a brand new page, data loss results

• Spage created this task.Aug 15 2015, 4:10 AM

• Spage updated the task description. (Show Details)

• Spage raised the priority of this task from to High.

• Spage added a project: MediaWiki-Page-editing.

• Spage added a subscriber: • Spage.

Restricted Application added a subscriber: Aklapper. · View Herald TranscriptAug 15 2015, 4:10 AM

Aklapper added a parent task: T41272: Bugs in "Live preview" feature (tracking).Aug 15 2015, 10:22 AM

Yeah this is a difference in behavior between the api and the edit page.
It mostly has to do with the fact that the diff api is a subpart of the revisions api. And for a new article, there is no revision yet of course...

https://en.wikipedia.org/w/api.php?action=help&modules=query%2Brevisions

TheDJ added a project: MediaWiki-API.Sep 2 2015, 6:48 AM

TheDJ set Security to None.

TheDJ added a project: MediaWiki-API.

And the API bug here is?

In T109166#1596720, @Anomie wrote:

TheDJ added a project: MediaWiki-API.

And the API bug here is?

There is a disjunct between editing page abilities and api abilities. That seems to me like a shared problem, that both tags should get an opportunity to discuss.

Probably the thing to do here is to add fromtext and totext (and possibly frompst and topst) to action=compare.

Anomie moved this task from Needs details or plan to Needs Code on the MediaWiki-API board.Sep 3 2015, 4:19 PM

Change 236078 had a related patch set uploaded (by TheDJ):
[WIP] API: Compare should be able to deal with text

https://gerrit.wikimedia.org/r/236078

gerritbot added a project: Patch-For-Review.Sep 4 2015, 7:33 PM

Anomie moved this task from Needs Code to In Dev on the MediaWiki-API board.Sep 10 2015, 2:55 PM

Ricordisamoa renamed this task from Show changes in Live preview indicates no changes in a brand new file, data loss results to Show changes in Live preview indicates no changes in a brand new page, data loss results.Mar 31 2016, 2:33 AM

Ricordisamoa added a subscriber: Ricordisamoa.

Anomie edited projects, added Patch-Needs-Improvement; removed Patch-For-Review.May 5 2017, 9:38 PM

Liuxinyu970226 added a subscriber: Liuxinyu970226.Jul 17 2017, 5:23 AM

Change 236078 abandoned by TheDJ:
[WIP] API: Compare should be able to deal with text

https://gerrit.wikimedia.org/r/236078

TheDJ added a parent task: T176558: AJAX "Show changes" doesn't work when creating a page: "TypeError: response[0].query.pages[0].revisions is undefined".Feb 8 2018, 5:37 PM

MGChecker moved this task from Backlog to Live preview on the MediaWiki-Page-editing board.Nov 15 2018, 10:21 PM