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[GH-ISSUE #693] Unwanted artifacts on screen when scrolling text with a lot of unicode characters #507

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opened 2026-03-04 01:05:34 +03:00 by kerem · 7 comments

kerem commented

2026-03-04 01:05:34 +03:00

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Originally created by @darkhz on GitHub (Jan 25, 2022).
Original GitHub issue: https://github.com/rivo/tview/issues/693

While dealing with text that has a lot of unicode, the characters end up "stuck" on the screen, and in the case of the table, the selector malfunctions. Please take a look at the video.

@rivo @tslocum, I'm really sorry for tagging, but I believe this issue to be critical. Any advise would be much appreciated.

https://user-images.githubusercontent.com/44058754/150971461-9a763188-14b6-4552-a328-c5d94dd08e15.mp4

Originally created by @darkhz on GitHub (Jan 25, 2022). Original GitHub issue: https://github.com/rivo/tview/issues/693 While dealing with text that has a lot of unicode, the characters end up "stuck" on the screen, and in the case of the table, the selector malfunctions. Please take a look at the video. @rivo @tslocum, I'm really sorry for tagging, but I believe this issue to be critical. Any advise would be much appreciated. https://user-images.githubusercontent.com/44058754/150971461-9a763188-14b6-4552-a328-c5d94dd08e15.mp4

kerem closed this issue

2026-03-04 01:05:35 +03:00

kerem commented

2026-03-04 01:05:36 +03:00

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@darkhz commented on GitHub (Jan 26, 2022):

An update on this issue:
The bug occurs on this line (util.go)

screen.SetContent(finalX+offset, y, main, comb, finalStyle)

Writing certain combined runes (?) to the output can cause the entire UI to break, with text being rendered incorrectly and so on.
Setting comb to nil temporarily solves this issue. I can provide another video to show this issue if you'd like.

@darkhz commented on GitHub (Jan 26, 2022): An update on this issue: The bug occurs on this line ([util.go](https://github.com/rivo/tview/blob/90d72bc664f52ed57f244a95cb8dddcf4dd03751/util.go#L416)) `screen.SetContent(finalX+offset, y, main, comb, finalStyle)` Writing certain combined runes (?) to the output can cause the entire UI to break, with text being rendered incorrectly and so on. Setting `comb` to `nil` temporarily solves this issue. I can provide another video to show this issue if you'd like.

kerem commented

2026-03-04 01:05:36 +03:00

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@tslocum commented on GitHub (Jan 28, 2022):

Please share the text that causes this breakage as well as the application code responsible for displaying it.

@tslocum commented on GitHub (Jan 28, 2022): Please share the text that causes this breakage as well as the application code responsible for displaying it.

kerem commented

2026-03-04 01:05:36 +03:00

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@darkhz commented on GitHub (Jan 30, 2022):

@tslocum apologies for the delay.

The application code is simple enough, it can be anything that displays/handles text like a Table/TableCell, InputField, TextView, etc.

package main

import "github.com/rivo/tview"

func main() {
	App := tview.NewApplication()
	Input := tview.NewInputField()

	Input.SetLabel("Edit this: ")
	Input.SetText("🔥🔥🔥 में f कैसे लगाएं??जाने बहुत ही खास Colour")

	if err := App.SetRoot(Input, true).SetFocus(Input).Run(); err != nil {
		panic(err)
	}
}

You should notice certain characters "sticking" inside the inputfield.

(Weirdly, some editors like vim and micro also have problems with rendering combined runes. Micro handles unicode in a somewhat similar manner to tview, and the same thing occurs while editing text in micro - the entire UI breaks)

@darkhz commented on GitHub (Jan 30, 2022): @tslocum apologies for the delay. The application code is simple enough, it can be anything that displays/handles text like a Table/TableCell, InputField, TextView, etc. ``` package main import "github.com/rivo/tview" func main() { App := tview.NewApplication() Input := tview.NewInputField() Input.SetLabel("Edit this: ") Input.SetText("🔥🔥🔥 में f कैसे लगाएं??जाने बहुत ही खास Colour") if err := App.SetRoot(Input, true).SetFocus(Input).Run(); err != nil { panic(err) } } ``` You should notice certain characters "sticking" inside the inputfield. (Weirdly, some editors like vim and micro also have problems with rendering combined runes. Micro handles unicode in a somewhat similar manner to tview, and the same thing occurs while editing text in micro - the entire UI breaks)

kerem commented

2026-03-04 01:05:36 +03:00

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@rivo commented on GitHub (Feb 16, 2022):

Seems to be related to some issues in other packages. I've opened up issue gdamore/tcell#515.

@rivo commented on GitHub (Feb 16, 2022): Seems to be related to some issues in other packages. I've opened up issue gdamore/tcell#515.

kerem commented

2026-03-04 01:05:36 +03:00

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@rivo commented on GitHub (Feb 16, 2022):

Also mattn/go-runewidth#59.

@rivo commented on GitHub (Feb 16, 2022): Also mattn/go-runewidth#59.

kerem commented

2026-03-04 01:05:36 +03:00

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@rivo commented on GitHub (Sep 11, 2022):

I made a suggestion over at go-runewidth, see https://github.com/mattn/go-runewidth/issues/59#issuecomment-1242923961, and also submitted a PR (https://github.com/mattn/go-runewidth/pull/63). When this PR gets accepted, your problem should be solved, at least after this change propagates via tcell (@gdamore) to tview.

I don't know how fast @mattn is with this. We'll see.

@rivo commented on GitHub (Sep 11, 2022): I made a suggestion over at `go-runewidth`, see https://github.com/mattn/go-runewidth/issues/59#issuecomment-1242923961, and also submitted a PR (https://github.com/mattn/go-runewidth/pull/63). When this PR gets accepted, your problem should be solved, at least after this change propagates via `tcell` (@gdamore) to `tview`. I don't know how fast @mattn is with this. We'll see.

kerem commented

2026-03-04 01:05:36 +03:00

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@rivo commented on GitHub (Aug 26, 2023):

Is this issue still relevant? I believe Unicode should work properly now. If there is no further comment soon, I will close this issue.

@rivo commented on GitHub (Aug 26, 2023): Is this issue still relevant? I believe Unicode should work properly now. If there is no further comment soon, I will close this issue.