Add option to lock graphic elements

[Frank Severinsen]

Hi guys

I would find it super useful to be able to lock graphic items (primarily edgecut)
when using outlines made in a mechanical environment, they quickly get really complicated, and will never be changed manually.
at the same time I often accidentally select one of the smaller edgecut elements when moving a block of components.

This might be somewhat related to this bug report:
https://bugs.launchpad.net/kicad/+bug/1670428

Application: kicad
Version: 5.1.0-060a0da~80~ubuntu18.10.1, release build
Libraries:
    wxWidgets 3.0.4
    libcurl/7.61.0 OpenSSL/1.1.1 zlib/1.2.11 libidn2/2.0.5 libpsl/0.20.2 (+libidn2/2.0.4) nghttp2/1.32.1 librtmp/2.3
Platform: Linux 4.18.0-17-generic x86_64, 64 bit, Little endian, wxGTK
Build Info:
    wxWidgets: 3.0.4 (wchar_t,wx containers,compatible with 2.8) GTK+ 3.24
    Boost: 1.67.0
    OpenCASCADE Community Edition: 6.9.1
    Curl: 7.61.0
    Compiler: GCC 8.2.0 with C++ ABI 1013

Build settings:
    USE_WX_GRAPHICS_CONTEXT=OFF
    USE_WX_OVERLAY=ON
    KICAD_SCRIPTING=ON
    KICAD_SCRIPTING_MODULES=ON
    KICAD_SCRIPTING_PYTHON3=ON
    KICAD_SCRIPTING_WXPYTHON=ON
    KICAD_SCRIPTING_WXPYTHON_PHOENIX=ON
    KICAD_SCRIPTING_ACTION_MENU=ON
    BUILD_GITHUB_PLUGIN=ON
    KICAD_USE_OCE=ON
    KICAD_USE_OCC=OFF
    KICAD_SPICE=ON

[John Beard (john-j-beard)]

I find it's also a bit too easy to move zone fills by accident when working near the edges of them.

[Frank Severinsen (shack)]

That's true as well, doesn't happen nearly as often for me but should definitely be included. Text in silk is also a case where it happens for me

[Seth Hillbrand (sethh)]

Me too. Let's fix this. How about we allow the locked flag on any element? In the course of fixing this, I'd like to allow multiple select modes:

1) No locked items
2) Select locked items

This could be a check box in the select tool preferences window (once such a thing exists) along with the rest of the filter options.

Related to lp:1745627

[John Beard (john-j-beard)]

@Seth: I think a locked flag on every element is a good idea. I can see it could be useful on nearly every element (nearly anything could be hard design requirement w.r.t. board location). Also probably is easier from a consistency PoV.

[Hildo Guillardi Júnior (hildogjr)]

Could be also interesting lock the full layer at the right panel. This cover the case of move edge-cuts (or tracks when we are just re-positing silks, ...).

[Hildo Guillardi Júnior (hildogjr)]

Also merge/group graphical elements to be locked (as asked here lp:1837771).

[Serg (serg1975)]

yes yes yes!!! grouping and locking future is nessesary!!!