Make 'Select by pattern' dialog case insensitive or provide checkbox
When I tried the 'Select by pattern' dialog, I presumed that it was case insensitive by default, similar to when you type a name in the file pane or search in catfish, but as it is not I would suggest that it be made case insensitive always or alternatively have a checkbox in the dialog to notify the user of this option.
Code reference https://gitlab.xfce.org/xfce/thunar/-/blob/master/thunar/thunar-standard-view.c#L2214