New lines character is weirdly rendered in layout label item text, breaking expressions

[qgib]

Author Name: Harrissou Santanna (@DelazJ)
Original Redmine Issue: 19743
Affected QGIS version: 3.3(master)
Redmine category:expressions

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Open a layout and add a label item
Using the "Insert expression" button, I wrote a long multiline expression, to improve readability.
Code looks valid and I applied.
Later on, I decided to add more details to the expression, hence selected the whole content of the label item's "main properties" frame, including the brackets and click "insert expression"
In the new dialog, the previously successful expression is marked as invalid and some weird characters are added to the command.
Give a look to the attached image showing the code I first wrote, and then how it's rendered at reopening the dialog.

It looks like the new line character is not handled in the code.

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• breaklines.png (Harrissou Santanna)

[qgib]

Author Name: Nyall Dawson (@nyalldawson)

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Applied in changeset bb91170.

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• done_ratio was changed from 0 to 100
• status_id was changed from Open to Closed

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• resolution was changed from to fixed/implemented