Line editing for chat messages breaks with the character "裔"

[dstu]

When entering a chat message (in INSERT mode), pasting a character like 裔 (a 3-byte character in UTF-8: https://codepoints.net/U+88d4) causes the text insertion point to be drawn incorrectly. When appending text, it is drawn over characters instead of at the end of the line. I suspect that this is the result of computing an offset incorrectly.

For correct behavior, see this image, which shows where the text insertion point is located after I type asdf asdf:

For incorrect behavior, see this image, which shows where the text insertion point is located after I type asdf裔asdf:

After typing this character and exiting from INSERT mode, it is no longer possible to position the insertion point at the end of the text that has been entered. Pressing [END] and then a (to append text to the end of the line) allows text to be appended properly, but the text insertion point is located in a confusing position (which makes it look like text is going to be inserted between characters, when it is actually going to be appended).

[VAWVAW]

I can't reproduce the fault using the main branch and foot Which terminal are you using and are you using iamb 0.0.10 or a git version?

[dstu]

Sorry, @VAWVAW, I just noticed your question today. I can still reproduce this in kitty and rxvt-unicode (urxvt). I have everything installed via Debian apt (unstable):

• rxvt-unicode 9.31-3+b2
• kitty 0.41.1-2+b1
• iamb 0.0.10-1
• Also, iamb built from a recent commit (55456db)

[VAWVAW]

I still can't reproduce the issue. I am running iamb 55456db on kitty 0.42.2 and urxvt rxvt-unicode (urxvt) v9.31 from nixpkgs. Typing iasdf<C-V>u88d4asdf<ESC>0$a in a chat leads to the expected result of appending to the end of the line.

Maybe someone else can try to reproduce this.

[bezier-h]

Hi,

I have the same issue with iamb 55456db on foot 1.24.0 with the ’ character. Only difference with what has already been reported is that instead of having the cursor before its expected position, it is after. See the following screenshot, and keep in mind there is not trailing space in my input: the cursor is right after after the n character. If I add more ’ chars, more space accumulates.

Please note that the issue is not about being able to append text to the end of line, but that the cursor is not placed at the end of the line while inserting text.