[tab completion] multi cursor behaviour different to emmet

[aeschli]

Testing #9698:

• enable tab completion: "editor.tabCompletion": true
• create a html snippet

     "Div": {
        "prefix": "div",
        "body": [
            "<div>",
            "    ${}",
            "</div>"
        ],
        "description": "New div"
    }

• in a html file have a multiple lines with content 'div'. Set multiple cursors after each div. Press tab.
  👉 primary div is expanded
• do the same with multiple lines of span, press tab
  👉 tab character is added at each of the cursors

Not sure if the emmet behaviour is intentional.
It would be cool if the expansion happens on every cursor.

[jrieken]

I like

[jrieken]

@aeschli It seems we only support (and that already today) snippets and multi cursor when no placeholders are defined. I see how that makes sense, but the 'final selection'-placeholder should always be supported. Still, moving to August since became more work than I though

[jrieken]

Reopening as a 'fix' for #11742

[gheoan]

vscode's behavior is still different to emmet.

emmet:

• In a HTML file have multiple lines with content 'div'. Set multiple cursors after each 'div'. Press tab.
  => All 'div' are expanded.

vscode:

• "editor.tabCompletion": false.
• "emmet.triggerExpansionOnTab": true
• No html snipped with div prefix.
• In a HTML file have multiple lines with content 'div'. Set multiple cursors after each 'div'. Press tab.
  => Tab character is added at each of the cursors.

[ramya-rao-a]

@gheoan The emmet related behavior is tracked in #9571