Hi, Check the demo. Press F1 will shift hightlight format. If caret position is not the same as selection in format tag?, and invisible?, then some scroll will happen.
And, where should I report issue like this? i...@tecgraf.puc-rio.br?
```lua
local iup=require'iuplua'
local Line=1
iup.dialog{
iup.text{
MULTILINE='YES',
EXPAND='YES',VISIBLELINES=3,
FORMATTING='YES',
VALUE="a123456\nb123456\nc123456\nd123456\ne123456\nf123456\ng123456\nh123456\ni123456",
map_cb=function(Text)
Text.CARET='5:1'
end,--map_cb
k_any=function(Text,C)
if C==iup.K_F1 then
Line=math.fmod(Line,tonumber(Text.LINECOUNT))+1
local Tags=iup.user{
BULK='YES',
CLEANOUT='YES',
iup.user{
SELECTION=Line..',1'..':'..Line..',5',
BGCOLOR='220 220 220',
},
}
Text.addformattag=Tags
end
end,--k_any
},--text
}:show()
iup.MainLoop()
```<<attachment: iup_text_format_scroll_bug.gif>>
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