tests/test_general.py: test_4902(): update to match fixed behaviour in mupdf master.

Author: julian-smith-artifex-com

tests/test_general.py

@@ -2241,5 +2241,14 @@ def test_4902():
     with pymupdf.open('pdf', data) as doc:
         page = doc[0]
         spans = page.get_texttrace()
-        for span in spans:
-            print(f'test_4902(): {span["linewidth"]=}, should be {bw*fontsize=}.')
+        for i, span in enumerate(spans):
+            cs = ''.join([chr(cc[0]) for cc in span['chars']])
+            print(f'test_4902(): {i=} {span["linewidth"]=} {cs=}')
+        assert len(spans) == 2
+        if pymupdf.mupdf_version_tuple >= (1, 28):
+            assert spans[0]['linewidth'] is None
+            assert spans[1]['linewidth'] == 8.0
+        else:
+            # Expect incorrect values.
+            assert spans[0]['linewidth'] == 1.0
+            assert spans[1]['linewidth'] == 1.0