gnucash maint: Multiple changes pushed

[Christopher Lam]

Updated	 via  https://github.com/Gnucash/gnucash/commit/eea5ac98 (commit)
	 via  https://github.com/Gnucash/gnucash/commit/9bb2e4a2 (commit)
	 via  https://github.com/Gnucash/gnucash/commit/fbc7c902 (commit)
	from  https://github.com/Gnucash/gnucash/commit/043abcb4 (commit)



commit eea5ac98c0330995706225f2a8f8ba62a5390d51
Author: Christopher Lam <christopher.lck at gmail.com>
Date:   Tue Nov 19 19:11:55 2019 +0800

    [stylesheet-plain][html5] omit <h3></h3> when headline is empty.
    
    We compare headline with "", rather than test (string-null? headline),
    because headline may be either a string or a complex gnc:html-text
    object.

commit 9bb2e4a21af7a85693474cf51ed7bb9423a6ab4e
Author: Christopher Lam <christopher.lck at gmail.com>
Date:   Tue Nov 19 19:10:43 2019 +0800

    [html-fonts][html5] add html,body height 100vh
    
    This CSS rule allows children elements (such as <canvas>) to inherit
    100% viewport height for displaying full-screen charts. This is
    necessary for standards-mode.
    
    https://quirks.spec.whatwg.org/#the-html-element-fills-the-viewport-quirk

commit fbc7c9027ed49e8311fc37800499753a70840ab8
Author: Christopher Lam <christopher.lck at gmail.com>
Date:   Mon Nov 18 21:19:50 2019 +0800

    [scm/utilities] even more efficient list-flatten functions
    
    because:
    
    * list? is O(N), because it needs to test for an improper
    list. improper lists are lists whose last pair's cdr cell is not
    '(). null? and pair? are both O(1).
    
    * avoids reverse which is also O(N): guile has unlimited stack
    therefore we can do non-tail-call loop first to pass as parameter to
    the tail-call loop. this removes the need for prepend-and-reverse.



Summary of changes:
 gnucash/report/report-system/html-document.scm  |  3 ++-
 gnucash/report/report-system/html-fonts.scm     |  1 +
 gnucash/report/stylesheets/stylesheet-plain.scm |  2 +-
 libgnucash/scm/utilities.scm                    | 12 ++++++------
 4 files changed, 10 insertions(+), 8 deletions(-)