Do not justify last line

Tests/test_imagefont.py

@@ -267,16 +267,19 @@ def test_render_multiline_text_align(
     assert_image_similar_tofile(im, f"Tests/images/multiline_text{ext}.png", 0.01)
 
 
-def test_render_multiline_text_align_justify_single_word(
+def test_render_multiline_text_align_justify_last_line(
     font: ImageFont.FreeTypeFont,
 ) -> None:
-    im = Image.new("RGB", (185, 65))
+    im = Image.new("RGB", (280, 60))
     draw = ImageDraw.Draw(im)
     draw.multiline_text(
-        (0, 0), "hey you\nyou are awesome\nthis", font=font, align="justify"
+        (0, 0),
+        "hey you you are awesome\nthis\nlooks awkward",
+        font=font,
+        align="justify",
     )
 
-    assert_image_equal_tofile(im, "Tests/images/multiline_text_justify_single_word.png")
+    assert_image_equal_tofile(im, "Tests/images/multiline_text_justify_last_line.png")
 
 
 def test_unknown_align(font: ImageFont.FreeTypeFont) -> None:

src/PIL/ImageDraw.py

@@ -770,7 +770,7 @@ class ImageDraw:
                 msg = 'align must be "left", "center", "right" or "justify"'
                 raise ValueError(msg)
 
-            if align == "justify" and width_difference != 0:
+            if align == "justify" and width_difference != 0 and idx != len(lines) - 1:
                 words = line.split(" " if isinstance(text, str) else b" ")
                 if len(words) > 1:
                     word_widths = [