Bug report #12888
Symbol with data-defined size that evaluate to NULL are drawn
|Affected QGIS version:||master||Regression?:||No|
|Operating System:||Easy fix?:||No|
|Pull Request or Patch supplied:||Yes||Resolution:|
|Crashes QGIS or corrupts data:||No||Copied to github as #:||20978|
To allow the preview and the drawing of the symbol with data-defined properties, the property is given a default value when the expression is NULL.
As a result, for DD size expression, symbols are drawn with the default size when the field is NULL. This gives different results than 2.8.