doc: GUI Python dependency is not documented #33146

1. 
   fanquake commented at 3:31 pm on August 6, 2025: member

   See this thread: #31233 (review)

   (Actually, while testing, a missing python is now a hard error already when -DBUILD_GUI=ON. So I don’t think the wording “refactor” accurately represents the changes here.)

   This bug still exists. rm -rf ./bld-cmake && cmake -B ./bld-cmake -DBUILD_GUI=ON now fails with:

   So it would be good to revert this pull, or adjust the docs:

   We need to decide whether to document the GUI dep, or re-adjust the code. cc @hebasto

2. fanquake added the label Docs on Aug 6, 2025
3. purpleKarrot referenced this in commit 3c4a109aa8 on Aug 19, 2025
4. purpleKarrot referenced this in commit 3786d55a33 on Aug 19, 2025
5. fanquake closed this on Aug 19, 2025

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6. fanquake referenced this in commit 22e689587a on Aug 19, 2025

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