Data defined expressions with single number get lost

[qgib]

Author Name: Nyall Dawson (@nyalldawson)
Original Redmine Issue: 9823
Affected QGIS version: master
Redmine category:expressions

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If I go into data defined properties for a symbol, and create an expression which contains only a single numeric value, eg "10", then this expression is immediately lost after clicking the OK button. A workaround is entering an expression such as "10+0", which is accepted by QGIS and retained.

I realise it's probably not that common to have a single constant value as an expression, but it should still be possible to do this.

[qgib]

Author Name: Giovanni Manghi (@gioman)

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Still true on the latest master, while another issue (the one that stripped "(" from the data defined expressions) seems solved.

Moreover the workaround 10+0 does not works on master.

Merging with #18325

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• resolution was changed from to duplicate
• fixed_version_id was configured as Version 2.4
• status_id was changed from Open to Closed