PCBNew - add mouse explanation to slope-locked polygons

[DDuck007]

At actual version selecting an edge of a polygon is not possible - the only points that can be selected and moved are the "round" ones. The "square" points can neither be selected nor moved (see picture).

Application: KiCad
Version: (5.99.0-36-g71c7bf327), release build
Libraries:
    wxWidgets 3.0.4
    libcurl/7.65.0 OpenSSL/1.1.1b (Schannel) zlib/1.2.11 brotli/1.0.7 libidn2/2.1.1 libpsl/0.21.0 (+libidn2/2.1.1) nghttp2/1.38.0
Platform: Windows 8 (build 9200), 64-bit edition, 64 bit, Little endian, wxMSW
Build Info:
    wxWidgets: 3.0.4 (wchar_t,wx containers,compatible with 2.8)
    Boost: 1.70.0
    OpenCASCADE Community Edition: 6.9.1
    Curl: 7.65.0
    Compiler: GCC 8.3.0 with C++ ABI 1013

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

[Seth Hillbrand (sethh)]

Is your polygon an H/V/45-only limit? Look in properties.

When constrained like this, you cannot move the corners (they would make the constraint invalid)

[DDuck007 (dduck007.01)]

Yes of course - that is it!
Thought it is an error due to the fact that Version 5.1.4 does allow it.
Thank you - i got it!

[Seth Hillbrand (sethh)]

This was a long time bug. It should be fixed in 5.1.5 as well. It probably makes sense to include a mouse-context warning explaining this.

[Ian McInerney (imcinerney)]

Moving to 6.0 since it was decided [1] that for 5.1 the constraints will not be used for editing the zone, only for creation.

[1] https://<email address hidden>/msg36764.html

[KiCad Janitor (kicad-janitor)]

KiCad bug tracker has moved to Gitlab. This report is now available here: https://gitlab.com/kicad/code/kicad/-/issues/1927