Footprint Checker error messages are truncated if they are too long

Description

The error messages in the footprint checker dialog box are truncated if they are too long

Screenshot_from_2021-11-09_11-06-07

Steps to reproduce

  1. Run Footprint checker that generates a long error message
  2. The horizontal scroll bar does not allow you to scroll to the right enough and the full error message is cut off.

KiCad Version

Application: KiCad Footprint Editor

Version: 5.99.0-unknown-ed3642c5c7~143~ubuntu20.04.1, release build

Libraries:
	wxWidgets 3.0.4
	libcurl/7.68.0 OpenSSL/1.1.1f zlib/1.2.11 brotli/1.0.7 libidn2/2.2.0 libpsl/0.21.0 (+libidn2/2.2.0) libssh/0.9.3/openssl/zlib nghttp2/1.40.0 librtmp/2.3

Platform: Linux 5.11.0-37-generic x86_64, 64 bit, Little endian, wxGTK, ubuntu, x11

Build Info:
	Date: Nov  8 2021 09:55:14
	wxWidgets: 3.0.4 (wchar_t,wx containers,compatible with 2.8) GTK+ 3.24
	Boost: 1.71.0
	OCC: 7.5.2
	Curl: 7.68.0
	ngspice: 31
	Compiler: GCC 9.3.0 with C++ ABI 1013

Build settings:
	KICAD_USE_OCC=ON
	KICAD_SPICE=ON
Edited by Greg