Switch font and theme based on major mode

[yarray]

Hi,

First thanks for the fantastic effort of the project. As a vimer it is really thrilling to enjoy the extensibility of Emacs without giving up most benefits of vim.

Currently I use Spacemacs in two scenarios: writing (markdown, LaTeX, etc.) and coding (js, python, R, etc.). I'd like to have different look & feel in the scenarios since the mindsets are also different.

Here is what I am currently trying:

(defun writing-theme()
  (when (window-system)
    (load-theme 'tao-yang t)
    (set-frame-font "Palatino-16" t)))

(add-hook 'markdown-mode-hook 'writing-theme)

The theme can be switched but it has following problems:

1. The font will not be switched
2. If I do ec <filename>.md the hook function will not be invoked, where ec is the GUI version of Emacs in OSX.
3. When fullscreen, the frame cannot fit the screen well with a blank area at the bottom.

If the load-theme is removed, the font switching work as expected, but issue 2 remains.

[github-actions]

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