Fix weird logic with the 'Edit filter action' dialog.
fix paste error in string. Thanks to David Medina for noticing and reporting it
Honor GTK project name¹, except some files… …where it refers to previous name of the project. ¹ https://mail.gnome.org/archives/gtk-devel-list/2019-February/msg00000.html
add image to Delete buttons
fix a bunch of buttons in dark corners. add some images to others
Fix CID 1491147 and 1491153: null ptr dereference, resource leak.
Remove duplicate includes
Normalize g_warning's: no capitalization, no trailing punctuation or newline-char. Fix few messages (simply wrong, or typos).
Action prefs: be smarter about detecting what's been modified when cancelling an action edit (warn if action type has changed whereas a command-line was set before).
fix text on Delete buttons in alertpanels
Add top/bottom buttons to the actions list. Simplify existing code of up/down callbacks.
Fix callback function names.
fix non-translation of some button labels
Get and set window sizes and positions compatible with CSD.
fix some unshrinkable windows
replace deprecated GtkTable (and a few display fixes
replace deprecated gtk_vbox_new() and gtk_hbox_new()
replace deprecated gtk_menu_popup()
replace deprecated gtk_arrow_new()
replace deprecated GtkStock