reorder and add missing autocompletion

completion/_catimg

@@ -37,12 +37,13 @@ local context state state_descr line ret=1
 typeset -A val_args
 
 _arguments \
+ '-c[convert colors to a restricted palette]' \
  '-h[display a help message]' \
- '-w[specify the width of the displayed image]' \
+ '-H[specify the height of the displayed image]' \
  '-l[specify the amount of loops that catimg should repeat a GIF]' \
  '-r[force the resolution of the image]: :->resolution' \
- '-c[convert colors to a restricted palette]' \
  '-t[disable true color and use 256 color instead]' \
+ '-w[specify the width of the displayed image]' \
  '*: :_files' && ret=0
 
 [[ "$state" == 'resolution' ]] && _values 'resolution value' 1 2 && ret=0