src/__init__.py: Annotation.get_textpage(): added assert for mupdf.FZ_STEXT_CLIP_RECT.

mupdf.FZ_STEXT_CLIP_RECT is not in current mupdf-1.25.x release.

Author: julian-smith-artifex-com

src/__init__.py

@@ -1030,6 +1030,7 @@ def get_textpage(self, clip=None, flags=0):
         CheckParent(self)
         options = mupdf.FzStextOptions(flags)
         if clip:
+            assert hasattr(mupdf, 'FZ_STEXT_CLIP_RECT'), f'MuPDF-{mupdf_version} does not support FZ_STEXT_CLIP_RECT.'
             clip2 = JM_rect_from_py(clip)
             options.clip = clip2.internal()
             options.flags |= mupdf.FZ_STEXT_CLIP_RECT