Tofi not respecting anchor and resolution/scaling on Niri

[Motodavide]

As the title and the image say tofi doesn't seem to acknowledge screen parameters on Niri. I don't know how to debug so this is all I got (in theory Niri supports layer-shell).

[itshog]

I faced the same issue, which also happens with bemenu albeit in a different manner (anchor is ignored, but the sizing is too and the content doesn't get stretched as in tofi).

After some testing, it turns out that anchoring is ignored also by plasma's kwin (so maybe the code in tofi and bemenu uses something specific to wlroots), while the sizing issue happens only in compositors using smithay like niri (so it may be a bug/omission in smithay).

See the related issues:

• bemenu: --center flag not working on kwin and smithay, -W flag not working on smithay Cloudef/bemenu#422
• niri: Wrong positioning and sizing of some layer shell applications (bemenu, tofi) YaLTeR/niri#575

[itshog]

As a side note, both anchoring and sizing work properly under kwin and smithay compositors when using fuzzel, so maybe there's a way to implement these options in a more "generic" way which works across wlroots, kwin and smithay at the same time

[itshog]

I found the cause of the bug by comparing tofi's code for centering to fuzzel's code: basically, instead of specifying all anchors to center the surface, as tofi does, it should specify no anchor at all. See this fuzzel commit.

I'll try writing a patch this evening.