Fixes https://gitlab.com/kicad/code/kicad/-/issues/17527
This is required as during an undo / redo operation, rebuilding
the previous selection can result in a group / generator being
selected as well as all of their contained items. This prunes
the contained items to remove the possibility of a double-delete.
(It's still leaking into BOARD_COMMIT and some other places, but at
least it no longer leaks into all the edit tools.)
Also fixes some bugs when moving/copying/pasting multiple selections
containing length-tuning patterns.
This allows common operations like merging a pin courtyard
into the body courtyard in the fooprint editor, taking a
"bite" out of a polygon and so on,
For now, this only supports polygons made of straight lines.
There are some wierd cases when the operations result in nothing
(e.g. wen a big polygon is substracted from a smaller one that
it contains entirely). I have tried to do something senisble in
these cases, but there may be more optimal ways to handle it.
Relates-To: https://gitlab.com/kicad/code/kicad/-/issues/13025
This needs the ITEM_MODIFICATION_ROUTINE to learn to delete items.
Condense the item change handlers into a single injected object
(ITEM_MODIFICATION_ROUTINE::CHANGE_HANDLER) and provide the basic
implementation that just takes some callables.
This simplifies the construction of the routines and also would make
a CHANGE_HANDLER object possible that can be reused between different
tools.
In the EDIT_TOOL::ModifyLines method, there was some
remaining special-casing for FP childen commits.
One bit was put back by mistake (in
0b32ae3f4b) because I thought I'd
left it out of the refactor. In fact it was removed slightly later in
1218f61d0a.
THe other bit is omitting Modify commits in the FP-editor (what the
reinstatement of the above code was trying to cause). This shouldn't
be needed any more.
However, something is still incomplete here as the tools still don't
work correctly in the footprint editor. However, I don't think it's
substantially _more_ broken with the special casing removed and at
least it's less confusing.
Related to: https://gitlab.com/kicad/code/kicad/-/issues/15253
Using the new ITEM_MODIFICATION_ROUTINE system, drop in two new
tools: chamfer and line extend. These are two geometric operations
that are relatively common when editing footprints in particular.
Chamfer delegates the geometric calculations to a dedicated unit
in kimath/geometry.
Describe the actions of the fillet tools is a generic way, so that the
same general pattern can be used for other tools that modify shapes on
the BOARD.
Basically, an "ITEM_MODIFICATION_ROUTINE" is defined, which is
configured and called multiple times, calling back to the EDIT_TOOL when
it modifies or creates an item.
The motivation here is to make it easier to slot in new line-based
tools like chamfer, extend and so on without having to redo the
complicated item, selection and commit handling each time, and keep the
core "routines" simple and decoupled from the EDIT_TOOL's
internals.
This also resolves#15094 because the new commit handling does the right
thing when items were "conjured up" for the fillet (e.g. when a
rectangle is decomposed into lines).
Fixes: #15094
JamesJ
Jeff Young
Seth Hillbrand
Alex Shvartzkop
jean-pierre charras
Jon Evans
Ian McInerney
John Beard
Josue Huaroto