Hello The last test from the attached ztst reveals this. Before-last test overlapping colors with standard fg=green/fg=red symbols. Result is a word "true" with "r" in red the rest in green. You can see the colors by doing cat /tmp/output. With true color, I get: --- /tmp/zsh.ztst.77121/ztst.out 2018-11-07 14:11:51.000000000 +0100 +++ /tmp/zsh.ztst.77121/ztst.tout 2018-11-07 14:11:51.000000000 +0100 @@ -2,5 +2,5 @@ rh2() { region_highlight+=( "1 2 fg=#cc0000" ); } zle -N rh_widget bindkey "\C-a" rh_widget -0m32mt31mr39m32mue39m +0mt38;2;204;0;0mr39mue The minus-line is not yet updated, inherited from basic 8-colors case (which is working and overlapped colors can be observed in the minus-line). But look at the plus-line. It doesn't emit any color for "t", only true-color red for "r", and then nothing for "ue". With zsh/nearcolor loaded (test code pasted at the end of this email), colors are correctly overlapped: --- /tmp/zsh.ztst.76836/ztst.out 2018-11-07 14:09:32.000000000 +0100 +++ /tmp/zsh.ztst.76836/ztst.tout 2018-11-07 14:09:32.000000000 +0100 @@ -3,5 +3,5 @@ rh2() { region_highlight+=( "1 2 fg=#cc0000" ); } zle -N rh_widget bindkey "\C-a" rh_widget -0m32mt31mr39m32mue39m +0m38;5;40mt38;5;160mr39m38;5;40mue39m cat /tmp/output confirms this. zsh/nearcolor test case: zpty_start zpty_input 'zmodload zsh/nearcolor' zpty_input 'rh_widget() { BUFFER="true"; region_highlight+=( "0 4 fg=#00cc00" ); rh2; }' zpty_input 'rh2() { region_highlight+=( "1 2 fg=#cc0000" ); }' # `r' in red; the above line would be too long zpty_input 'zle -N rh_widget' zpty_input 'bindkey "\C-a" rh_widget' zpty_input $'\C-a' zpty_line 5 # 3 lines echoed back + 3 empty lines (zpty bug) zpty_line 1 p zpty_stop 0:overlapping region_highlight with true-color >zmodload zsh/nearcolor >rh_widget() { BUFFER="true"; region_highlight+=( "0 4 fg=#00cc00" ); rh2; } >rh2() { region_highlight+=( "1 2 fg=#cc0000" ); } >zle -N rh_widget >bindkey "\C-a" rh_widget >0m32mt31mr39m32mue39m >exit -- Sebastian Gniazdowski News: https://twitter.com/ZdharmaI IRC: https://kiwiirc.com/client/chat.freenode.net:+6697/#zplugin Blog: http://zdharma.org