Remove STAT table in to_static.

Author: fabiocaccamo

fontbro/font.py

@@ -2361,6 +2361,10 @@ def to_static(
         # instantiate the static font
         instancer.instantiateVariableFont(font, coordinates, **options)
 
+        # remove STAT table
+        # not useful in static fonts and after instancing it may contain incorrect values
+        self._remove_stat_table()
+
         # update name records and style flags based on instance style name
         if instance and update_names:
             self.rename(
@@ -2375,6 +2379,19 @@ def to_static(
             if has_italic or has_slant:
                 self.set_style_flags(regular=False, italic=True)
 
+    def _remove_stat_table(self) -> bool:
+        """
+        Removes the STAT table from the font.
+
+        :returns: True if the STAT table was removed, False if it was not present.
+        :rtype: bool
+        """
+        font = self.get_ttfont()
+        if "STAT" in font:
+            del font["STAT"]
+            return True
+        return False
+
     def __str__(
         self,
     ) -> str:

tests/test_instantiation.py

@@ -1,3 +1,4 @@
+from fontbro import Font
 from tests import AbstractTestCase
 
 
@@ -131,6 +132,20 @@ def test_to_static_without_update_names_without_update_style_flags_and_italic_in
         )
         self.assertFalse(font.get_style_flag("italic"))
 
+    def test_to_static_removes_stat_table(self):
+        font = self._get_variable_font()
+        self.assertIn("STAT", font.get_ttfont())
+        font.to_static(coordinates={"wght": 400, "wdth": 100})
+        self.assertNotIn("STAT", font.get_ttfont())
+
+    def test_to_static_stat_table_not_present_in_saved_file(self):
+        font = self._get_variable_font()
+        font.to_static(coordinates={"wght": 400, "wdth": 100})
+        output_filepath = self._get_font_temp_path("")
+        font_saved_filepath = font.save(output_filepath, overwrite=True)
+        font_saved = Font(font_saved_filepath)
+        self.assertNotIn("STAT", font_saved.get_ttfont())
+
     def test_to_sliced_variable_with_static_font(self):
         font = self._get_static_font()
         with self.assertRaises(TypeError):