Resizing terminal font doesn't adjust the size and position of preview image

[jdujava]

I use image previews in lf via ueberzugpp. After resizing the terminal font, the image preview is not located at proper position. Exiting lf and starting new instance (in the terminal with resized font) fixes the sizing and positioning of the preview.

Perhaps lf setups some variables depending on the font size (which concern preview size/positioning) only at the start?

[joelim-work]

Have you tried logging the parameters to the previewer script (e.g. x, y, width, height) whenever it runs? These values are measured in cells, so they should change whenever the terminal resizes.

[jdujava]

You are right, the values (x, y, width, height) are indeed changing on the font resizing. It seems, that ueberzug/ueberzugpp just has trouble adapting to the new font size.

[joelim-work]

I finally had some time to look at this, it seems like the issue is to do with ueberzugpp. I updated that issue with my own findings. In the meantime please try https://github.com/ueber-devel/ueberzug to see if that works for you instead.

[joelim-work]

Yeah, I tried following your steps, and ueberzug properly updated both position and size of the image, while ueberzugpp didn't.

This is maybe more suited to mention in lf issue, but position/size of previews in lf didn't update with neither ueberzug or ueberzugpp. But this can be caused by my setup and way of launching lf with ueberzug, more than with their response to resizing.

That seems strange if ueberzug can work by itself but not while running lf. lf doesn't actually do anything special with ueberzug at all, it's all controlled by user configuration. Have you tried:

• Ensuring the previewer script is being called with the correct arguments when resizing the terminal?
• Simulating the previewer script by manually writing the JSON commands to the fifo?
• Verifying that you're not accidentally launching ueberzugpp instead of ueberzug when running lf?

[jdujava]

Now I see that my message wasn't very clear. Position/size of previews was changing on new preview updates, but it was still stuck with the old "fontsize".

Now I have located the culprit. I was launching ueberzug with lf via

setsid ueberzug layer -s <"$FIFO_UEBERZUG" &

where setsid (don't know the exact details) precluded ueberzug to obtain updates about the terminal font size. Running with

ueberzug layer -s <"$FIFO_UEBERZUG" &

results in ueberzug properly adapting to resizes. Still, as you pointed out directly, ueberzugpp is not able to react to font size changes anyway.

@joelim-work Thank you very much for looking into this!