This should be simple. I have a list of Rects. I need the final Rect, that will contain them all.

code https://github.com/ninmonkey/pygame-demos.git

If you un-comment line #165 it will print and draw the error. Somehow full.height grows every loop. It should be local only to that function, and not be a reference. I tried full = Rect(self.rect) and full = self.rect.copy() but neither seem to work.

def _calc_offset(self):
    # offsets for each line. Place each rect below the previous.
    #full = Rect(self.rect)
    full = self.rect.copy()

    prev = Rect(self.rect)
    for t in self.text_lines:            
        print("  line = ",full)
        t.rect.topleft = prev.bottomleft
        prev = t.rect.copy()
        full = full.union(t.rect)

    # verify containment        
    print("full.size=", full.size)
    #print("self.size=", self.rect.size)

    #bug: this line causes full to increase height every loop
    #self.rect = full.copy()

    if debug: pygame.draw.rect(self.screen, Color("pink"), full, 1)
    if debug: pygame.draw.rect(self.screen, Color("green"), self.rect, 1)