dotspacemacs-fullscreen-at-startup malfunctions on reload

[edrex]

when dotspacemacs-fullscreen-at-startup t, reloading config (SPC f e R) toggles the fullscreen state (full -> not full, not full -> full). Expected behavior: fullscreen state should not change on reload, only at startup, and it certainly shouldn't toggle full -> not full. See #277

[TheBB]

Unfortunately, there is no variable that holds the current full-screen or maximized status, so these toggles are somewhat defective. We have to write a bit of a hack to make it work. :-)

I'm closing this is a duplicate of #1088. I think I know how to do it, though... I should have a PR soonish.

[TheBB]

#3211