Image thumbnail aspect ratios are too landscapey, particularly for portrait-type images

[pureandclear]

• I have searched open and closed issues for duplicates

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Bug description

Image thumbnails are cropped to have a rather extreme landscape (short and wide) aspect ratio, which looks particularly bad if the original image was portrait (tall and narrow).

Steps to reproduce

Send a photo on Signal. Something with a portrait aspect ratio (tall and narrow) will demonstrate it best.

Actual result:

On mobile, the image thumbnail more closely (not perfectly) preserves the aspect ratio of the original image. But on desktop, the image thumbnail is cropped rather extremely to be landscape (wide and short), highly disregarding the aspect ratio of the original image.

Expected result:

Both mobile and desktop should show similar thumbnails, at least somewhat preserving the aspect ratio of the original image.

Screenshots

Here is the test image I used, a portrait of Thomas Jefferson (from Wikipedia).

Thumbnail on mobile:

Thumbnail on PC:

You can see that while the mobile thumbnail does not use the exact aspect ratio of the original, it is at least somewhat close. The desktop thumbnail, however, looks really different from the original.

Platform info

Signal version:

1.15.5

Operating System:

Windows 10 64-bit

Linked device version:

Android 4.25.6

[pureandclear]

I should add: I'm using a 16:9 monitor. This only happens when it's maximized. If I shrink the window to be narrower, the thumbnail is more true to the original image.

[dront78]

It is always happen on window resize, so the image shapes are changed every time.
I can view received portraits only if I resize the main window to have more or less same proportions.
ArchLinux and Signal Desktop v1.16.0

[Xashyar]

issue seem to be mitigated in 1.19.0

[dront78]

confirmed