Upload and text-input reliability
Read window.__inputFixture.caption. Type it into the empty editor,
then fill the old multi-paragraph editor with the same text. Leave
perCharacter off for both. Native text insertion must preserve
Unicode, newlines, and literal markup without hundreds of key events.
Exact caption (manual baseline: copy and paste into both editors)
OLD first paragraph
OLD second paragraph
OLD third paragraph
Node-ID conversion failure is fault-injected by the Node unit tests; this page checks the real file contents and native upload event.