I have LibreOffice 126.96.36.199 in 16.04 via the fresh ppa.
GTK3 themes maybe easily modified by the user or they may not: the latter are compiled and will have files like
/usr/share/themes/Numix/gtk-3.0/**gtk.gresource and a folder like
What follows isn't easily possible to do with compiled themes.
If you have a gtk3 theme you can edit, open its
gtk-widgets.css with a plain text editor and, a few lines from the top of the file, look for something like:
/* default */
***..... lines deleted .....***
outline-color: alpha(@theme_fg_color, 0.3);
What is important is the last line with
-GtkWidget-cursor-aspect-ratio: 0.2; which may not be present normally. You will need to add it. If you are modifying the theme in
usr/share/themes, keep in mind, you'll need elevated privileges to edit the file and that an update to the theme may require you to edit the file all over again.
I prefer to copy over entire themes to
~/.themes and to rename the top theme folder to something convenient that I can tell them apart.
Without a line dealing with
-GtkWidget-cursor-aspect-ratio, you'll have a thin insertion bar:
If you edit the value to
0.1, you'll have a thick bar:
And, if you edit the value to
0.2, you'll have an even thicker bar:
Note that this will affect all your applications that use
Credit to: caret-color and caret-width