On codeberg community it was requested to make the wiki editor toolbar sticky for longer wiki posts, so one wouldn't have to scroll to the top to use it. (Reference; https://codeberg.org/Codeberg/Community/issues/533).

In order to make this happen, the .editor-toolbar class needs to become position: sticky, and we need to fix it's transparent background and border-bottom. Because the bottom disappears, we add it. This makes the border become a double border, because the CodeMirror area defines borders for all. As such I've added a border-top: none, on the wiki write tab for the CodeMirror class.

In issue go-gitea#10675 it's requested to make the issue bar sticky upon scrolling in the issue view. The proposed change changes inline html, which is not desirable. As such I've added the position sticky option to it's container, and fix the background upon scrolling.

Fix 0px -> 0 to make the linter happy.

Fix 0px -> 0 to make the linter happy.

As per review of @silverwind change the z-index to it's lowest requirement of 1.

As per review of @silverwind change the z-index to it's lowest requirement of 1.

Fixes the max-height to 85vh, on the proposed 90vh it just came out just slightly too large.
Unstickies the changes from the sticky commits.

Removes the changes as done by the sticky title editor.

Add the max-height definition for the CodeMirror-scroll class in order to generalize the changes spoken about in PR go-gitea#18271

Remove the max-height in CodeMirror-scroll definition, in order to generalize it in the CodeMirror less file. As per discussion in go-gitea#18271.