Page Layout Editor: Undo zooms to fit the page

[Ian McInerney]

If you undo an action in the page layout editor, it will modify the zoom so that the entire frame is in the view and disregard your prior zoom level.

Reproduce:
1) Zoom into the title block
2) Delete a line
3) Undo this
4) Note that now the entire page is in view

Application: PlEditor
Version: (5.1.0-1400-g9dcf3b862), 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 5.1.18-300.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: 7.65.3
    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

[KiCad Janitor (kicad-janitor)]

Fixed in revision 2b3207079385946e7efd5bc2ef3896a2a15ef0e5
https://git.launchpad.net/kicad/patch/?id=2b3207079385946e7efd5bc2ef3896a2a15ef0e5