Fix regression tdf#149206 caused by my previous patch. (patch <https://gerrit.libreoffice.org/c/core/+/134703>) Add unit test to prevent similar future regressions. (patch <https://gerrit.libreoffice.org/c/core/+/134845>) Detect WMF from magic bytes in graphicfilter2. (patch <https://gerrit.libreoffice.org/c/core/+/134876>)
Next: Create a plan for the saving functionality and start working on it.
