Bug report #16725
Parser error in Atlas 'Output filename expression' textbox - badly handled error
|Affected QGIS version:||2.14.15||Regression?:||No|
|Operating System:||Windows 10||Easy fix?:||No|
|Pull Request or Patch supplied:||No||Resolution:||no timely feedback|
|Crashes QGIS or corrupts data:||Yes||Copied to github as #:||24624|
When manually entering the 'Output filename expression', if you leave the textbox before the expression is fully parsable, you get an error message box (see image attached). The problem is that when you click 'OK', instead of returning you to the textbox to correct the expression, you just get the message box again, for ever. The only way out I could find is to kill the whole application, so effectively I think QGIS is crashed by this.
(I gave this Category of 'Map Composer/Printing', but maybe should be 'Expressions'?)