Bug report #14142
M ordinate is lost on shapefile update
|Affected QGIS version:||master||Regression?:||No|
|Operating System:||Easy fix?:||No|
|Pull Request or Patch supplied:||No||Resolution:||up/downstream|
|Crashes QGIS or corrupts data:||No||Copied to github as #:||22144|
Opening an XYM or XYMZ shapefile and editing its attributes results in loosing the M ordinate value from the original shapefile.
This is an unwarned lossy operation, pretty bad for an unaware user.
This ticket is a spin-off of #11422
Either M support should be added to OGR or QGIS should print a big warning and ask if the user wants to continue with the destructive operation.