Don’t draw invisible characters

Even spaces seem to be ignored by PDF readers, that probably rely more on text
layout than on actual word separators.

weasyprint/draw.py

@@ -1052,6 +1052,10 @@ def draw_emojis(stream, font_size, x, y, emojis):
 def draw_first_line(stream, textbox, text_overflow, block_ellipsis, x, y,
                     angle=0):
     """Draw the given ``textbox`` line to the document ``stream``."""
+    # Don’t draw lines with only invisible characters
+    if not textbox.text.strip():
+        return []
+
     font_size = textbox.style['font_size']
     if font_size < 1e-6:  # Default float precision used by pydyf
         return []

weasyprint/svg/text.py

@@ -12,6 +12,10 @@ class TextBox:
         self.pango_layout = pango_layout
         self.style = style
 
+    @property
+    def text(self):
+        return self.pango_layout.text
+
 
 def text(svg, node, font_size):
     """Draw text node."""