https://bugs.documentfoundation.org/show_bug.cgi?id=101862

--- Comment #5 from jan d <[email protected]> ---
> Please, could describe some example?

Sure. So build-in shapes of that kind are most of the block arrows: They use a
(yellow) handle to allow adjustment of the arrow shape. Internally, they use
code like: 

    <draw:handle draw:handle-position="$0 $1" draw:handle-range-x-minimum="0" …

and

    … draw:enhanced-path="M 21600 ?f0 L ?f1 ?f0 …

to allow that. 

Such custom shapes can also be created by users, like these:
http://lautman.net/mark/coo/index.html 

see, for example, the GUI elements in
http://lautman.net/mark/coo/GUI_Elements.odg 

There is a shape named "progress bar" which progress bar length can be adjusted
via a yellow handle. This is very useful, since without that one would need to
move these manually after entering the group etc. 

All the custom handles and behavior needed to be calculated (to find the right
points) and written by hand using the unzip/edit/zip/reopen workflow.

…Does the example help in understanding this better?

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