[Tcl-bugs] [SPAM] [Tk] (mtmcp_) com (tip-754-ttk-composed-pixmaps-cache): ttk image element: cache tiled element as a background-free photo

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Commit [785f0dee44f6746686a8679c84a745447c6b81c7833b8415ac2444c24d0aee6c]
  By      mtmcp_
  For     Tk (branch: tip-754-ttk-composed-pixmaps-cache)
  On      2026-06-03T02:03:39.989
  Details https://core.tcl-lang.org/tk/info/785f0dee44f6746686a8679c84a745447c6b81c7833b8415ac2444c24d0aee6c

Description
   ttk image element: cache tiled element as a background-free photo

   Compose the element once into an RGBA photo (keyed by size and state)
   and draw it each frame with Tk_RedrawImage, re-compositing against the
   live destination. This replaces the old seed-pixmap composite, which
   baked in the background and so went stale under translucent elements
   and could bleed between widgets sharing a style.

Changed Files
  1 edited
           generic/ttk/ttkImage.c

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