All UI components in LO have a custom caret (insertion point), not following the system theme's size and color for it (irrespective of options under LO/Accessibility).  This applies to Writer's text area, Calc's cells, or any text entries like the search box or some preferences.

It is problematic for accessibility purposes where some users want a larger/differently colored caret to help spot it more easily.

GTK2 theme options for that are:

* GtkWidget::cursor_color (color: https://developer.gnome.org/gtk2/stable/GtkWidget.html#GtkWidget--s-cursor-color)
* GtkWidget::secondary_cursor_color (color for secondary caret at RTL/LTR bounds: https://developer.gnome.org/gtk2/stable/GtkWidget.html#GtkWidget--s-secondary-cursor-color)
* GtkWidget::cursor_aspect_ratio (size: https://developer.gnome.org/gtk2/stable/GtkWidget.html#GtkWidget--s-cursor-aspect-ratio)

Some themes (like HighContrast) set those on specific widgets instead, like GtkTextView, GtkEntry and EelEditableLabel instead of GtkWidget directly.

This applies at least from 4.2 to 5.3.0.1, but probably also on older versions.  Using the GTK2 backend, but the GTK3 one is likely affected.


Steps to reproduce:

1. Alter the caret color and size on your theme.  For example, drop the following snippet in ~/.gtkrc-2.0:

# --8<--
style "caret"
{
  GtkWidget::cursor_color = "#FF0000"
  GtkWidget::cursor_aspect_ratio = 0.2
  GtkTextView::cursor_color = "#00FF00"
  GtkTextView::cursor_aspect_ratio = 0.2
  GtkEntry::cursor_color = "#0000FF"
  GtkEntry::cursor_aspect_ratio = 0.2
}
class "GtkWidget" style "caret"
# --8<--

2. Open any GTK2 app proposing text entries, and see the caret is larger and of a different color (depending on the type of input field with my example).

3. Open LO, and see no changes to the caret.