The warning dialogs that are displayed to the user when libraries are not found should be unified across all instances. Currently, the information displayed in each one is different, and many of them contain information the user does not need (such as source code file names & line numbers since some are based on IO exception dialogs).
The one that looks like it would be the best is the one that is used when you start lib edit and there are missing libraries. This style should be implemented for the symbol place dialog and footprint viewer (along with anyothers).
The current dialog versions are attached, so you can see the information they contain.
This is for master (that exact commit below isn't in the main source tree, it is a branch I am working on, but I have not touched the dialogs):
Application: KiCad
Version: (5.1.0-1324-gcc4fcc6db), debug build
Libraries:
wxWidgets 3.0.4
libcurl/7.64.0 OpenSSL/1.1.1c zlib/1.2.11 brotli/1.0.7 libidn2/2.1.1 libpsl/0.20.2 (+libidn2/2.0.5) libssh/0.8.7/openssl/zlib nghttp2/1.37.0
Platform: Linux 5.1.16-300.fc30.x86_64 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: 1.69.0
OpenCASCADE Community Edition: 6.9.1
Curl: 7.64.0
Compiler: Clang 8.0.0 with C++ ABI 1002
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
Found another one, the window that opens when footprint libraries are missing in the assign footprints dialog should be changed as well.