[jackhogan]

explanations/docs.ipynb already says that exec_all: true in a notebook's frontmatter makes nbdev execute all cells when rendering docs, but nothing currently reads the flag. exec_show_docs runs only exports, imports, show_doc calls and cells marked #| exec_doc, and skips a notebook with no exports or show_doc calls altogether.

After this change, with exec_all set (either in frontmatter or under [tool.nbdev]), exec_show_docs runs every code cell that nbdev-test would run: eval: false, the notebook's eval default, tst_flags and the skip-execution tag are honoured, and skip_showdoc still wins. Execution happens before rm_export and hide_, so cells run with their full source.

Will be useful for a project that strips or clears outputs before committing (#1664) but still wants those outputs in the rendered docs.

[jph00]

Great! :)