Fix x0>x1 error for rect fills, per new Pillow

Pillow 9.5 throws an error when you try to draw a rectangle where x0>x1
or top>bottom. For rects with small width or height but thick strokes,
we ended up hitting that error because we were trying to subtract the
stroke width from the area to be filled.

pdfplumber/display.py

@@ -231,14 +231,13 @@ def draw_rect(
 
         x0, top, x1, bottom = bbox
         half = stroke_width / 2
-        x0 += half
-        top += half
-        x1 -= half
-        bottom -= half
+        x0 = min(x0 + half, (x0 + x1) / 2)
+        top = min(top + half, (top + bottom) / 2)
+        x1 = max(x1 - half, (x0 + x1) / 2)
+        bottom = max(bottom - half, (top + bottom) / 2)
 
-        self.draw.rectangle(
-            self._reproject_bbox((x0, top, x1, bottom)), fill, COLORS.TRANSPARENT
-        )
+        fill_bbox = self._reproject_bbox((x0, top, x1, bottom))
+        self.draw.rectangle(fill_bbox, fill, COLORS.TRANSPARENT)
 
         if stroke_width > 0:
             segments = [