[okular] [Bug 492957] Text annotations with a zero-area bounding box can not be opened (no pop up).

[ederag]

https://bugs.kde.org/show_bug.cgi?id=492957

--- Comment #6 from ederag <edera at gmx.fr> ---
Looking for the specs there
https://pdfa.org/resource/pdf-specification-archive/
which links to
https://web.archive.org/web/20080624230300/http://www.adobe.com/devnet/acrobat/pdfs/pdf_reference_1-7.pdf

> BBox: rectangle
> (Optional for Annot; required for any figure or table appearing in its entirety on
> a single page; not inheritable). An array of four numbers in default user space
> units giving the coordinates of the left, bottom, right, and top edges, respec-
> tively, of the element’s bounding box (the rectangle that completely encloses
> its visible content). This attribute applies to any element that lies on a single
> page and occupies a single rectangle.

I searched the spec, and nothing seems to prevent a zero-area bounding box.
Rationale: the viewer then gets to choose the appropriate hover area.

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