Fixing issue py-pdf#1223: pdf.font_style now behaves like pdf.set_font

CHANGELOG.md

@@ -41,6 +41,7 @@ This can also be enabled programmatically with `warnings.simplefilter('default',
 * In [text_columns()](https://py-pdf.github.io/fpdf2/extColumns.html), paragraph top/bottom margins didn't correctly trigger column breaks; [issue #1214](https://github.com/py-pdf/fpdf2/issues/1214)
 * [`fpdf.drawing.color_from_hex_string`](https://py-pdf.github.io/fpdf2/fpdf/drawing.html#fpdf.drawing.color_from_hex_string) did not test or mention accepting lowercase hex values.
 * handling of bidirectional text on `FPDF.get_string_width()` [issue #1231]
+* pdf.font_style now behaves like pdf.set_font() `FPDF.font_style` [issue #1223]
 * new translation of the tutorial in [Indonesian](https://py-pdf.github.io/fpdf2/Tutorial-id.html) - thanks to @odhyp
 ### Removed
 * an obscure and undocumented [feature](https://github.com/py-pdf/fpdf2/issues/1198) of [`FPDF.write_html()`](https://py-pdf.github.io/fpdf2/fpdf/fpdf.html#fpdf.fpdf.FPDF.write_html), which used to magically pass instance attributes as arguments.

test/fonts/test_set_font.py

@@ -55,6 +55,19 @@ def test_set_builtin_font(tmp_path):
             pdf.text(0, 10 + 40 * i + 10 * j, "Hello World!")
     assert_pdf_equal(pdf, HERE / "fonts_set_builtin_font.pdf", tmp_path)
 
+def test_issue_1223(tmp_path):
+    pdf = FPDF()
+    pdf.add_page()
+    pdf.set_font("Helvetica", size=32)
+    with pdf.text_columns() as cols:
+        with cols.paragraph() as par:
+            par.write(text="Un.")
+        pdf.font_style = "B"
+        with cols.paragraph() as par:
+            par.write(text="Deux.")
+            pdf.font_style = "I"
+            par.write(text="Trois.")
+    assert_pdf_equal(pdf, HERE / "fonts_issue_1223.pdf", tmp_path)
 
 def test_issue_66(tmp_path):
     pdf = FPDF()