Duncan McIntosh authored Sep 05, 2023 and Zander Brown committed Oct 23, 2023

In a sheet, objects can have an intdata attribute, which is usually used
in I*/GRAFCET/UML to pick a different variation of the object. It does
this by setting user_data, but some objects --- like AADL's --- use
this property for a vtable. It's possible to get Dia to crash with a
sheet something like the following:

    <?xml version="1.0" encoding="UTF-8" standalone="no"?>
    <sheet xmlns="http://www.lysator.liu.se/~alla/dia/dia-sheet-ns">
      <name>Proof of Concept</name>
      <description>Tada!</description>
      <contents>
        <object name="AADL - Process" intdata="2">
          <description>Dereference 0x2</description>
        </object>
      </contents>
    </sheet>

To fix this, only set user_data if the object type has
DIA_OBJECT_HAS_VARIANTS set; only objects that actually want it will
have it set.

"Misc - Measure" never used it anyways, so just remove it from the
sheet.