"Source" icon is different in Flow wikitext mode, Flow VE mode, and VE. Ideally all of them should use the same icon, but at least we should make sure the same icon is used in the same product.
Aspects to determine:
- The appropriate metaphor: Flow uses a more generally recognisable "</>" to represent code, while in VE a more specific "[]" is used to represent wikitext. A general metaphor may be usable for a wider audience (e.g., users not afraid to dealing with code such as markdown or html), while a more specific metaphor may be more direct to those users that know that wikitext is what is behind the rich text content.
- Whether the icon is recognisable enough. If we find it is not, we can consider making it more prominent (e.g., use more prominent and quicker tooltips, add a label, etc.)