A new field is added to a part in the part library editor when the Field Properties dialog is opened. So below the Datasheet field a new field "Fieldname" with the default value "Value" is added and retained if you press the OK button.
Subsequent opening of the dialog does not add more copies of the field.
Selecting the field and clicking "Delete Field" only removes "Value" and sets the field value to blank "". You must press Delete Field again to actually remove the field from the part!
Application: kicad
Version: (2015-09-15 BZR 6201)-product debug build
wxWidgets: Version 3.1.0 (debug,wchar_t,compiler with C++ ABI 1002,GCC 4.8.4,wx containers)
Platform: Linux 3.16.0-38-generic x86_64, 64 bit, Little endian, wxGTK
Boost version: 1.54.0
USE_WX_GRAPHICS_CONTEXT=OFF
USE_WX_OVERLAY=OFF
KICAD_SCRIPTING=OFF
KICAD_SCRIPTING_MODULES=OFF
KICAD_SCRIPTING_WXPYTHON=OFF
USE_FP_LIB_TABLE=HARD_CODED_ON
BUILD_GITHUB_PLUGIN=ON
Hi
This is deliberately behaviour of the "delete field" button (according to the source code)
The first press erase the value and the next press erase the field name.
> You must press Delete Field again to actually remove the field from the part!
This is not entirely true, the first press on "delete button" will erase the value
and if the user press the OK button the filed will be erased as well without the need
of pressing the delete button a second time.
Any field with an empty value will be erased when the OK button is pressed.
This bug tracker will be set into state invalid, a message have been sent to the author asking if this is a satisfied answear or
if the author want to continue to push it as a wish list.