Signal-desktop: Save images as jpg and not as jpeg

[PanderMusubi]

- [x] I have searched open and closed issues for duplicates

Bug Description

Save images as jpg and not as jpeg. All other software on desktop computer saves images as jpg so this needs extra manual changes in order to comply with what is expected on the desktop (for searching and managing images).

Steps to Reproduce

1. Send a photograph to yourself or have someone send a photograph to you.
2. Save that photograph from Signal Desktop to disk

Actual Result:

File name that is prompted / is suggested will have extension .jpeg

Expected Result:

File name that is prompted / is suggested will should have extension .jpg

Screenshots

Platform Info

Signal Version: 1.32.0-

Operating System: Ubuntu 19.10

Linked Device Version: Android 4.56.4

Link to Debug Log

n/a

See also https://community.signalusers.org/t/dont-use-jpeg-but-jpg-file-extension/12330

[scottnonnenberg-signal]

Signal Desktop bases almost all of its attachment filename data on information that comes to it from the sending client. Which sending client is generating .jpeg filenames? How was that file originally generated, then added to Signal?

[PanderMusubi]

If you send a .jpg and a .jpeg from the Android app, they both will be offered to be saved as .jpeg in the Desktop app, unfortuntely.

[UserX404]

@scottnonnenberg-signal
I ran into this issue and testet on Android and Win10x64 with note-to-self. Same picture with alternated extensions. Afterwards i saved to disk.
Sent from Android -> Android: both saved as jpg, W10 both jpeg
Sent from W10 -> Android: both as jpg. W10: jpeg and jpg (same as original file)

• It seems images always gets converted to jpg on Android and it doesn't matter if the original is jpeg, Jpeg or JPEG.
• It seems Desktop uses original file extension when it comes from desktop client but from an other client is is always jpeg.
• It seems Desktop doesn't convert lower case (JPG, JPEG, Jpg, Jpeg).

A consistent extension handling would be very welcome to get rid of duplicates unattached which client the image comes from.

Side note: The desktop's file size is bigger but i couldn't find a difference in quality.