When TableModelView includes unqualified emoji, whole string line is unreadable.

Definition of Unqualified Emoji

Unqualified emoji is defined here.

https://unicode.org/reports/tr51/#def_unqualified_emoji

When a list item includes unqualified emoji, whole list item is unreadable.

Unreadable Text

It shows something like triple dash in a box.

After remove unqualified emoji

Without unqualified emoji, rest of strings including qualified emoji are correctly shown.

Tested unqualified emoji

Warning emoji in U+26A0 causes this issue.

https://unicode.org/emoji/charts/full-emoji-list.html#26a0

Hot-fix for this issue

visu_data = msg.toStringPayload().trimmed().replace('\n', ' ').replace("⚠️","!"); 

Previously with Qt5.15.1

With 5.15.1, same payload in the message were correctly displayed.