Unify issue and wiki editors

[ypnos]

This is a feature request.

Description

Right now there is a unintuitive feature discrepancy between issues and wiki pages:

• Issue comments can have attached files, wiki pages cannot (see Uploads on the wiki #574)
• Wiki pages have a semi-WYSIYWG markdown editor UI, issues have a bare text form (related Feature Request: wysiwyg editor for issues and wiki #5436)

It would be great if both could share one interface that is feature-complete.

[Cherrg]

sets sum the tasks up:

Wiki

• add Write/Preview Buttons like in issues (wiki - add 'write' 'preview' buttons to wiki edit like in issues #7241 )
• add fileupload
  • backend+routes to allow file uploads to wiki repository (may by Implement basic file uploads to wiki #6024)
  • add dropzone like in issues
  • add inplace file insert (paste directly in editor -> is really not much js, if dropzone i working)
• add media listing like _pages to list file tree (complete) and for defined paths
  • allow file delete
  • add an api for this
• add file select to codemirror to browse files and insert link, uses api above

Issues

• add codemirror editor (simpleMDE) as this is near enough to an wysiwyg editor

I will add the editor to issues, but i will wait, until all features added to the wiki editor are in master branch. So I only need to copy from there. Otherwise I will have to manually look up all changes before i could reuse it the code there.

As some tasks could be done seperatly there could be smaller PRs.
I will implement some of this, and link the PRs here.

[6543]

this is a dublicate of #5436

and gitea v1.11.0 close this anyway ...

[ypnos]

Can wiki pages have attached files in 1.11? I don't see it in the changelog for RC1.

[6543]

no they dont have attachments jet

[ypnos]

The aim of this issue is a consistent behavior and feature parity between Issue and Wiki editors.

[6543]

lets leave it open ...

[wxiaoguang]

The editor problem has been fixed by latest editor refactoring PR

The wiki attachment problem is duplicate: #574