We added a fairly long message to the basic cite dialog: https://gerrit.wikimedia.org/r/#/c/355447/2. I imagine in other languages this may exceed the line length, at which point the placeholder will just truncate.
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In principle this is simple, but it creates a lot of issues for mobile; if a message is super long, and it's not truncated, it could take up the entire screen. Needs a lot of thought.
The use case here is a message that might spill onto 2 lines on desktop. We have quite a few issues with message lengths on mobile which can be addressed on a case by case basis, but the widget shouldn't fail with a long placeholder, and should behave like <textarea>.
Change 360578 had a related patch set uploaded (by Esanders; owner: Esanders):
[VisualEditor/VisualEditor@master] Allow multi-line placeholders on ui.Surface's
Change 360578 merged by jenkins-bot:
[VisualEditor/VisualEditor@master] Allow multi-line placeholders on ui.Surface's
Change 360583 had a related patch set uploaded (by Jforrester; owner: Jforrester):
[mediawiki/extensions/VisualEditor@master] Update VE core submodule to master (a25e5de67)
Change 360583 merged by jenkins-bot:
[mediawiki/extensions/VisualEditor@master] Update VE core submodule to master (a25e5de67)