term: print: erase existing OSC-8 URI

If we have an “active” OSC-8 URI, term_print() would correctly replace
an existing URI with the new one.

But, if we don’t have an active URI, an existing URI was not
erased. This can be reproduced with e.g

  echo -e '\e]8;;http://foo.bar\e\\foobar\e]8;;\e\\\b\b\b\b\b😀\n'

CHANGELOG.md

@@ -66,6 +66,8 @@
   (https://codeberg.org/dnkl/foot/issues/851).
 * Crash when maximizing the window and `[csd].size=1`
   (https://codeberg.org/dnkl/foot/issues/857).
+* OSC-8 URIs not getting overwritten (erased) by double-width
+  characters (e.g. emojis).
 
 
 ### Security

terminal.c

@@ -3262,7 +3262,8 @@ term_print(struct terminal *term, wchar_t wc, int width)
         case OSC8_UNDERLINE_URL_MODE:
             break;
         }
-    }
+    } else if (row->extra != NULL)
+        grid_row_uri_range_erase(row, col, col + width - 1);
 
     /* Advance cursor the 'additional' columns while dirty:ing the cells */
     for (int i = 1; i < width && col < term->cols - 1; i++) {