PCBNew: Layer Transparency is reseted when Opacity changed

[Silviu Laurentiu]

1. Decrease transparency for few layers using { key from keyboard
2. Change the opacity of 20% to any layer.
3. Increase transparency for the layer from above point 2, using } key from keyboard
4. Bug: The transparency of all layers from point 1 will be reset.

   Please see the attached video :-)

Application: kicad
Version: (5.1.2)-1, release build
Libraries:
    wxWidgets 3.0.4
    libcurl/7.61.1 OpenSSL/1.1.1 (WinSSL) zlib/1.2.11 brotli/1.0.6 libidn2/2.0.5 libpsl/0.20.2 (+libidn2/2.0.5) nghttp2/1.34.0
Platform: Windows 7 (build 7601, Service Pack 1), 64-bit edition, 64 bit, Little endian, wxMSW
Build Info:
    wxWidgets: 3.0.4 (wchar_t,wx containers,compatible with 2.8)
    Boost: 1.68.0
    OpenCASCADE Community Edition: 6.9.1
    Curl: 7.61.1
    Compiler: GCC 8.2.0 with C++ ABI 1013

Build settings:
    USE_WX_GRAPHICS_CONTEXT=OFF
    USE_WX_OVERLAY=OFF
    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

[Michael Kavanagh (michaelkavanagh)]

How bizarre... Surely the opacity slider in the layer colour picker should use/modify the transparency chosen with the { and } hotkeys?

[John Beard (john-j-beard)]

@Michael: This looks like an uncomfortable interaction between the layer "swatch" (which is what's shown in the layer pane) and the current layer colour, which is modified with { and }.

The current alpha of the layer set with { and } is not stored in the swatch, it's applied *on top* of the swatch. The indicator to the right (up/down) indicates if the current colour is more/less opaque than the swatch.

The bug is that the the current opacity of a different layer is somehow reset to the swatch value. It makes sense to me that the *current* layer gets the {} opacity reset when the swatch is changed.

[KiCad Janitor (kicad-janitor)]

Fixed in revision 638ac3838c499d1c4d1780e21233a327047fd147
https://git.launchpad.net/kicad/patch/?id=638ac3838c499d1c4d1780e21233a327047fd147