support adding slide_layout - #1091
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SlideLayouts.add_layout(name="Layout %s") appends a blank layout to a slide master, and SlideLayouts.clone(layout) deep-copies an existing layout of the same presentation under a non-colliding name. Both are usable with prs.slides.add_slide(), register a fresh presentation- unique p:sldLayoutId (max+1 over 2147483648), and pair with LayoutShapes.add_placeholder(), whose idx defaults to the matching master placeholder so inheritance and shapes.title keep working. The clone path reuses the _slide_importer utilities (_clone_xml_part, _remap_rids, and next_layout_hierarchy_id, extracted from _SlideImporter._next_hierarchy_id) so images and external links a layout refers to survive with remapped rIds. Port of scanny#1091 by wkpark.
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WIP
This is merely one example.
It does not function perfectly, and only some features work as intended.
Nevertheless, if you are planning to add or edit
slide layouts, please refer to this.#1044 - apply this suggestion into this PR.
examples
... prs = Presentation() ph_list = [ PP_PLACEHOLDER.TITLE, PP_PLACEHOLDER.CENTER_TITLE PP_PLACEHOLDER.SUBTITLE, PP_PLACEHOLDER.BODY, ] ... layout= prs.slide_layouts.add_layout("My Layout %s") ... ph = layout.shapes.add_placeholder(PP_PLACEHOLDER.TITLE, "horz", "full") ph.text = "insert Title here" ...