GdkPixbuf decided to soft-deprecate `from_xpm_data` causing all sorts of
rendering weirdness for us.

xpm-pixbuf is a fork of the old GdkPixbuf XPM code the acts as a drop-in
replacement.

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.

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

Not sure which bug this is, but it should probably be fixed instead of
kind-of worked around in a handful of objects.

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

We never do anything with it, and it can always be added later if
needed.

Duncan McIntosh authored Oct 16, 2023 and Zander Brown committed Oct 23, 2023

As in 3f802317, we assume C99, so no need to check whether it's defined.

Christoph Reiter authored Oct 21, 2023 and Zander Brown committed Oct 21, 2023

This was apparently overlooked in the move to meson