Please provide a specific example page to test with. Also, which browser(s) was this tested with?

Any page, better to be logged in (banners just for logged in users), any browser.

Try this combination:

page: https://cs.wikipedia.org/w/index.php?title=%C5%A0ablona:Infobox_Politik&action=edit
browser: Google Chrome 50
speed: 300kbps (or under 1Mbps at least)

This is probably CentralNotice's greatest hit T52865, also known as T109634, and similar problems in the TemplateData and DismissableSiteNotice extensions. The page @Dvorapa linked to has the particular misfortune of being affected by all three.

@ori yeah and don't forget to editor's header:

Another things to consider:
Do TemplateData buttons really need to be above the text editor field?
Do banners really need to be on Source Editor edit pages? (in VE edit interface they aren't)

Why is this tagged with VE?

@Esanders Because Herald adds it automatically (maybe it adds this tag automatically where TemplateData tag is added). I tried to remove it, but without success

https://phabricator.wikimedia.org/H10

@Dvorapa I have never understood why the TemplateData edit tool is not in the standard toolbox(es). Maybe @Mooeypoo remembers why he implemented it this way?

In T138177#2394934, @Ltrlg wrote:

why he

https://en.wikipedia.org/wiki/Implicit_stereotype#Gender_stereotypes :)

@Ltrlg +1 @ori +1

@ori Indeed. In my defense, “Moriel” is closer to men names in French (in the written form).

Sorry @Mooeypoo, I’ll try to remember for next time.

Change 296275 had a related patch set uploaded (by Ori.livneh):
Don't show the banner on action=edit

https://gerrit.wikimedia.org/r/296275

Thanks @ori and everyone! Just to copying here the rationale from the commit message of @ori's patch:

Don't show the banner on action=edit

• It's a nice gesture to contributors.
• Edit pages represent a small fraction of site traffic.
• On submitting an edit, the user is taken to the article view.
• We have editnotice for targetting edit pages specifically

So, editors who miss a banner on the edit page would see it after clicking "Save".

@Jseddon, @DStrine thoughts? Seems totally fine to me, and in the same spirit as our current blocking of banners on Special pages...

Administratia: following the title of this bug, it's a duplicate of T52865, so we might mark it as such? The description is nice, focusing on the issue when editing, and that's the only situation the patch solves targets... so, another option would be to narrow the bug to only that content jumps on edit pages.

But please create another task from this for templatedata buttons and editor header before you'll change this one to banner-on-edit-pages only

Change 296275 merged by jenkins-bot:
Don't show the banner on action=edit

https://gerrit.wikimedia.org/r/296275

The patch is merged and otherwise this doesn't seem to add much to T52865: CentralNotice shifts down page content on load (causes mis-clicks).