[Bug 1888910] [NEW] Image-file extension filtering is case sensitive

[Felipe G. Maia]

Public bug reported:

When searching your file system for an image file to create a bootable
device (CD, DVD, pendrive, etc), the software offers 2 extensions filter
to show the list of files available: "iso" and "img". Since it is a case
sensitive filter, files with an "ISO" or "IMG" extension won't be shown
and the user might think there is a problem with the software.

2 Suggestions:

- Make the filter case-insensitive.
- Give two filtering options: one for all types of images supported (iso and img) and a second option for all types of files (no filtering).


My system info:

- Package: usb-creator-gtk  Version: 0.3.7
- Ubuntu 20.04.1 LTS (Focal Fossa)
- GNOME version 3.36.3
- Theme: Dark
- Windowing System: Wayland

** Affects: usb-creator (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1888910

Title:
  Image-file extension filtering is case sensitive

Status in usb-creator package in Ubuntu:
  New

Bug description:
  When searching your file system for an image file to create a bootable
  device (CD, DVD, pendrive, etc), the software offers 2 extensions
  filter to show the list of files available: "iso" and "img". Since it
  is a case sensitive filter, files with an "ISO" or "IMG" extension
  won't be shown and the user might think there is a problem with the
  software.

  2 Suggestions:

  - Make the filter case-insensitive.
  - Give two filtering options: one for all types of images supported (iso and img) and a second option for all types of files (no filtering).

  
  My system info:

  - Package: usb-creator-gtk  Version: 0.3.7
  - Ubuntu 20.04.1 LTS (Focal Fossa)
  - GNOME version 3.36.3
  - Theme: Dark
  - Windowing System: Wayland

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