New infobar breaks the gal canvas.
The new infobar breaks the gal canvas area ( at least on W7), making all editors unusable:
The "canvas" area shows 2 separate panels instead of only one panel:
- the EDA_INFOBAR_PANEL wxPanel (I am guessing)
- the gal canvas wxPanel itself
And the gal canvas no longer receives some events: zoom (F1 F2) and mouse wheel.

```
Application: KiCad
Version: (5.99.0-1732-g480588866), release build
Libraries:
wxWidgets 3.1.3
libcurl/7.65.1 OpenSSL/1.1.1c (Schannel) zlib/1.2.11 brotli/1.0.7 libidn2/2.2.0 libpsl/0.21.0 (+libidn2/2.1.1) nghttp2/1.39.1
Platform: Windows 7 (build 7601, Service Pack 1), 32 bit, Little endian, wxMSW
Build Info:
Build date: May 20 2020 14:27:42
wxWidgets: 3.1.3 (wchar_t,wx containers)
Boost: 1.71.0
OpenCASCADE Community Edition: 6.9.1
Curl: 7.66.0
Compiler: GCC 9.2.0 with C++ ABI 1013
Build settings:
KICAD_SCRIPTING=ON
KICAD_SCRIPTING_MODULES=ON
KICAD_SCRIPTING_PYTHON3=OFF
KICAD_SCRIPTING_WXPYTHON=OFF
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
```
issue