Fix conda packaging (upstream behavior change) (#314)

* Try to fix conda not finding external deps

* Prepare changelog

README.md

@@ -126,7 +126,7 @@ pypdfium2 includes helpers to simplify common use cases, while the raw PDFium/ct
     
     Alternatively, with temporary channel config:
     ```bash
-    conda install pypdfium2-team::pypdfium2_helpers --override-channels -c pypdfium2-team -c bblanchon
+    conda install pypdfium2-team::pypdfium2_helpers --override-channels -c pypdfium2-team -c bblanchon -c defaults
     ```
     
     Adding the channels permanently and tightening priority is encouraged to include pypdfium2 in `conda update` by default, and to avoid accidentally replacing the install with a different channel. (If desired, you may limit the channel config to the current environment by adding `--env`.)

docs/devel/changelog_staging.md

@@ -6,3 +6,5 @@
 # Changelog for next release
 - `PdfPage.get_objects()`: Don't register pageobjects as children, because they don't need to be closed by the caller when part of a page. This avoids excessive caching of weakrefs that are not cleaned up with the object they refer to.
 - Autorelease: Swapped default condition for minor/patch update, as pypdfium2 changes are likely more API-significant than pdfium updates. Added ability for manual override.
+- Fixed conda packaging: It is now required to explicitly specify `-c defaults` with `--override-channels`, presumably due to an upstream change.
+- Bumped workflows to Python 3.12.

setupsrc/pypdfium2_setup/craft_packages.py

@@ -138,7 +138,7 @@ def main_conda_raw(args):
     os.environ["BUILD_NUM"] = str(_get_build_num(args))
     emplace_func = partial(prepare_setup, ExtPlats.system, args.pdfium_ver, use_v8=None)
     with CondaExtPlatfiles(emplace_func):
-        run_conda_build(CondaDir/"raw", CondaDir/"raw"/"out", args=["--override-channels", "-c", "bblanchon"])
+        run_conda_build(CondaDir/"raw", CondaDir/"raw"/"out", args=["--override-channels", "-c", "bblanchon", "-c", "defaults"])
 
 
 def main_conda_helpers(args):
@@ -149,7 +149,7 @@ def main_conda_helpers(args):
 
     # NOTE To build with a local pypdfium2_raw, add the args below for the source dir, and remove the pypdfium2-team prefix from the helpers recipe's run requirements
     # args=["-c", CondaDir/"raw"/"out"]
-    run_conda_build(CondaDir/"helpers", CondaDir/"helpers"/"out", args=["--override-channels", "-c", "pypdfium2-team", "-c", "bblanchon"])
+    run_conda_build(CondaDir/"helpers", CondaDir/"helpers"/"out", args=["--override-channels", "-c", "pypdfium2-team", "-c", "bblanchon", "-c", "defaults"])
 
 
 class ArtifactStash: