bug#28724: 25.3; height of echo area when displaying tooltip

[Alex Branham]

Hello,

If I have disabled tooltip-mode, is there a way to tell Emacs that it should 
expand the height of the echo area (where tooltips are displayed) if the 
tooltip is longer than the screen is wide? Currently the words just run off and 
I can't see them.

Additionally, I believe the info manual and docstring for 
`x-gtk-use-system-tooltips' may need updating. In section 21.18 Tooltips, it 
says "If Emacs is built with GTK+ support..." and goes on to state that users 
can change `x-gtk-use-system-tooltips' to nil. However, I was under the 
impression that the recommended way to do this was to call (tooltips-mode -1).

Thanks,
Alex


In GNU Emacs 25.3.1 (x86_64-pc-linux-gnu, GTK+ Version 3.22.19)
 of 2017-09-16 built on juergen
Windowing system distributor 'The X.Org Foundation', version 11.0.11903000
Configured using:
 'configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
 --localstatedir=/var --with-x-toolkit=gtk3 --with-xft --with-modules
 'CFLAGS=-march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong
 -fno-plt' CPPFLAGS=-D_FORTIFY_SOURCE=2
 LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GCONF GSETTINGS
NOTIFY ACL GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 MODULES

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix