gnucash maint: Multiple changes pushed

[Robert Fewell]

Updated	 via  https://github.com/Gnucash/gnucash/commit/cc12fcf3 (commit)
	 via  https://github.com/Gnucash/gnucash/commit/a22ad2e0 (commit)
	from  https://github.com/Gnucash/gnucash/commit/9056b14d (commit)



commit cc12fcf32203c2067b6dff843c5423decb163004
Author: Robert Fewell <14uBobIT at gmail.com>
Date:   Tue Jun 4 10:33:30 2019 +0100

    Add new function named similar to remove class function
    
    The existing function name to add CSS classes for style contexts was
    not correct so add a new function gnc_widget_style_context_add_class
    named similar to remove function and use it for the existing
    'gnc-class-highlight'. Change old function to use this new one with the
    old one being removed in master.

commit a22ad2e0b82f440634fd96debbbeacadcd9c850b
Author: Robert Fewell <14uBobIT at gmail.com>
Date:   Tue Jun 4 10:28:03 2019 +0100

    Bug 797246 - Cleared Balance Remains Red After Turning Positive
    
    When changing the negative numbers to red a CSS class is added to set
    the colour but it is not removed when changing the number becomes
    positive. Add function to remove a CSS class if present and use in the
    gnc_set_label_color function.



Summary of changes:
 gnucash/gnome-utils/dialog-utils.c | 32 ++++++++++++++++++++++++++++++--
 gnucash/gnome-utils/dialog-utils.h | 10 ++++++++++
 gnucash/gnome/dialog-invoice.c     |  2 +-
 gnucash/gnome/dialog-trans-assoc.c |  2 +-
 gnucash/gnome/gnc-split-reg.c      |  6 +++---
 5 files changed, 45 insertions(+), 7 deletions(-)