Diagrams: no friendly interface to update an existing expression (too hard)

[qgib]

Author Name: Harrissou Santanna (@DelazJ)
Original Redmine Issue: 15513

Redmine category:diagrams

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In layers's properties > Diagrams you can set an expression to build your diagram
Then if you want to rewrite this expression, double-clicking the expression simply offers you to write it within the text box, which is not easy nor friendly at all when you are using a complex expression.

I think that double-clicking an expression or at least, select the expression and push the expression builder button should open the expression builder dialog (prefilled with the current expression, as done when a field is selected in the left column) for an easy typing

[qgib]

Author Name: Harrissou Santanna (@DelazJ)

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Note that simply change the expression in the textbox seems to not really change the expression given that hitting "Apply" does nothing (see #23438)

[qgib]

Author Name: Harrissou Santanna (@DelazJ)

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works in 2.18.1 (f4c99d9)

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• resolution was changed from to fixed/implemented

[qgib]

Author Name: Harrissou Santanna (@DelazJ)

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• status_id was changed from Open to Closed