bug#43997: 26.3; Be able to have a mode-line for a standalone minibuffer frame

[Drew Adams]

Be able to have a mode-line for a standalone minibuffer frame.

Presumably this should be covered by the (undocumented) frame parameter
`modeline'.  But it seems that if you set its value to t for a
minibuffer-only frame, the parameter value ends up nil anyway.

You can set lots of frame parameters for a standalone minibuffer frame,
but apparently not this one.  Not even if you set it from the outset,
for `minibuffer-frame-alist'.


In GNU Emacs 26.3 (build 1, x86_64-w64-mingw32)
 of 2019-08-29
Repository revision: 96dd0196c28bc36779584e47fffcca433c9309cd
Windowing system distributor `Microsoft Corp.', version 10.0.18362
Configured using:
 `configure --without-dbus --host=x86_64-w64-mingw32
 --without-compress-install 'CFLAGS=-O2 -static -g3''