vifm: Fix wezterm image preview with chafa

We now use chafa to preview images. We use its iterm mode
since that seems to be the best integrated into wezterm
currently.

We have to use uncached previews so it is a little slower,
but at least it functions perfectly after the first image
is displayed.

terminal/.config/vifm/vifmrc

@@ -427,12 +427,12 @@ fileviewer *.[1-8] man ./%c | col -b
 
 " Images
 filextype *.bmp,*.jpg,*.jpeg,*.png,*.gif,*.xpm
+        \ {View in imv}
+        \ imv %f %i,
         \ {View in viu}
         \ viu --once --name %f; read -k 1 -s -r,
         \ {View in nsxiv directory viewer}
         \ vifm-thumbnailer %c,
-        \ {View in imv}
-        \ imv %f,
         \ {View in nsxiv}
         \ nsxiv %f,
         \ {View in vimiv}
@@ -444,11 +444,9 @@ filextype *.bmp,*.jpg,*.jpeg,*.png,*.gif,*.xpm
         \ {View in gpicview}
         \ gpicview %c,
 fileviewer *.bmp,*.jpg,*.jpeg,*.png,*.gif,*.xpm
-        " to circumvent the bug: https://github.com/atanunq/viuer/issues/44
-        " thus, change the viuer library and build it with the new lib locally
-        " put it into the local bin directory and you can see full pics. 
-        " Otherwise falls back to block-sized display
-        \ exist ~/.local/bin/viu && env -u COLORTERM ~/.local/bin/viu -w %pw -s %c %pd || env -u COLORTERM viu -b -w %pw -s %c %pd
+        " needs to be %pu uncached or it flickers itself into oblivion :(
+        \ exist chafa && chafa -f iterm --size %pwx%ph %c:p %pd %pu %N || echo chafa not found
+set previewoptions+=graphicsdelay:0
 
 " OpenRaster
 filextype *.ora