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Unable to select text in pagination mode #23154
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opened 2026-01-31 08:33:50 +00:00 by claunia
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Reference: starred/terminal#23154
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Originally created by @compnerd on GitHub (Apr 14, 2025).
Windows Terminal version
1.22.10731.0
Windows build number
10.0.26100.0
Other Software
No response
Steps to reproduce
Using
git log(which useslessas a pager as per default), I am unable to simply double click on the commit hash to select the text. Attempting to do so will result in re-rendering the entire terminal continuously for a while. I've noticed thatESC0Dwill sometimes appear in the bottom left corner, making me believe that this is a bug in the ANSI sequence parser. It seems that there would be something odd going on with the CSI interpreter, possibly mishandling the initial byte?This seems to have triggered somewhat recently, though I cannot pin down whether it was a WT update or Patch Tuesday update.
The canary build seems to reproduce this as well.
Note that it helps to have a particularly large terminal (e.g. full screen).
Expected Behavior
No response
Actual Behavior
The terminal becomes non-responsive, redrawing the terminal.
@compnerd commented on GitHub (Apr 15, 2025):
I suspect a related exhibition of the issue is that if you type a partial command on the terminal, and then attempt to highlight text, instead of highlighting the text, the cursor is moved to the beginning of the line.
@DHowett commented on GitHub (Apr 16, 2025):
Hey @compnerd, nice to see you around these parts 🙂
Just a couple quick differential diagnostic questions...
I'm guessing that less enables a mouse mode (or requests a mouse mode) (or uses the Win32 console mode to request mouse mode and then enables VT input...) and doesn't know what to do with what it's getting back.
@compnerd commented on GitHub (Apr 16, 2025):
Hey @DHowett, great to see that you're still involved in Terminal! 😄
I think that I didn't clearly explain the issue, sorry. It will let me select text again, just only after it has completed repainting the terminal a large number of times. You can identify this process as being complete because the terminal is fully rendered and scrolled up a line (which matches the CSI of 0D). But, just to verify, Shift+click doesn't select any text during the re-draw phase.
One thing that is interesting is that once this has occurred, it will function properly subsequently. So there is something more interesting going on, possibly with state initialisation?
Well, the instructions seem complete enough, let me try to do that.
Hmm, I didn't think of that. You think that this could be related to DECELR? That would allow it to read the scroll "button" (wheel) to allow pagination.
@compnerd commented on GitHub (Apr 16, 2025):
Well, that doesn't seem to work very well - it seems to truncate the buffer before I can get the interesting stuff due to the re-rendering.
@compnerd commented on GitHub (Apr 16, 2025):
tap.txt
Okay, I used a different repository which doesn't have as big of a history, it actually is interesting as this is the second exhibition of the issue: it has already exited the pager (
less). However, the text selection seems to still trigger the issue. I'm attaching the tap as an attachment here.@compnerd commented on GitHub (Apr 22, 2025):
It seems that yet another exhibition of this issue is if you scroll up, trying to highlight any text will scroll and then highlight, preventing copying any text on any row above the current viewport.
@compnerd commented on GitHub (May 12, 2025):
Any suggestions on what to do here to dig into this further @DHowett? It is really making Terminal nearly impossible to use for development work.
@lhecker commented on GitHub (May 12, 2025):
If you have multiple PCs, does this issue also occur on your other machines? We sometimes get reports from people having a laggy experience, where it then turns out they have a corporate anti-virus installed. They can sometimes interfere with us processing the output in a timely manner.
Because the problem is that we have 1 mutex that protects the terminal state. That mutex gets acquired by the:
If any of the 3 take an unusually long time to process something, this would explain why you find it difficult to select text. Regarding each respective point:
So, theoretically each location that holds the mutex should hold it for reasonably short periods of time. This means, even if you have tons of VT output, and slow text rendering going on simultaneously, you should still be able to select text fluidly. Something else must be going on (could also be another bug in Windows Terminal).
If it's simple for you to do so, could you please capture a screen recording of the issue? Just so we're all on the same page.
@compnerd commented on GitHub (May 12, 2025):
The only antivirus that I have installed is Windows Defender.
I don't think that this is a rendering issue per se ... if you look at the log, there is a large number of CSI scroll events, so I suspect that it is unnecessarily adjusting the cursor position and view port for the text. This gives the impression of freezing as the cursor rehoming in a tight loop prevents the other operations from actually getting processed. Note that at the very end, the selected bounds are on the last frame while the text itself has scrolled out of the view port resulting in some arbitrary content being highlighted. I'll try to see if I can create a recording if you think that is more useful.
@DHowett commented on GitHub (May 13, 2025):
So, the
ESC0Dis a bit of a red herring. That's output from less after it receivesSS3 D(whereSS3isESC O.)That is the correct and complete encoding for cursor left in Application Keys mode (
DECCKMset).In your tap trace, I see that less is requesting
DECCKMwith termcapks(set$env:LESS_TERMCAP_DEBUG=1to see it), so that checks out. This is just a symptom though.As you've identified, something is generating an inordinate amount of input into your terminal session of the following two key events:
␛[37;75;0;1;0;1_Vk: VK_LEFTSc: 75Uc: 0Kd: downCs: 0␛[37;75;0;1;0;1_Vk: VK_LEFTSc: 75Uc: 0Kd: upCs: 0By my count, 8346 of them... which is consistent with your observed behavior.
There are three instances in which Terminal will emit
␛[37;75;0;1;0;1_(in this specific format) into the input buffer:Considering that there are ~8,300 combined left arrow presses and releases (4,173 presses), and that your tap contains a cursor position sequence indicating Y=47 X=35, I can only assume that your buffer is... let's conservatively guess 88x47.
That experimental feature works only on input lines and by literally trying to move the cursor left or right the same logical number of cells as appear to be occupied on the screen.
So, clicking somewhere in the top left of the screen will try to move the cursor left ~4,173 times.
I would say that we should disable the cursor repositioning feature when the alternate screen buffer is in use (as it is in less) but that would break tmux.
It's an experimental feature, though, so we can play with the heuristics a bit.
@DHowett commented on GitHub (May 13, 2025):
For now, though, try disabling it :)
@compnerd commented on GitHub (May 13, 2025):
I tried to glance through the tap trace but wasn't able to really split up the sequences even with the python script.
Agreed that the output of
ESC0Dis fromless, but I'm not entirely sure if it is entirely a red herring. It is just a symptom, not the cause of course.Yeah, this doesn't seem to be a processing speed thing but rather overloading the processing.
Ugh, I had completely forgotten about the experimental feature🤦
Oh, interesting! Why the preference for the simplistic approach (move cursor backwards) rather than something like the CUP CSI? At this point, that is pretty widely supported (including by Terminal). I suppose that the problem would be with more complex text layout and trying to map the position to a cell?
Verified that the experimental "reposition cursor with click" is indeed responsible. Interestingly enough, I think that I've seen some similar issues without the alternate buffer mode, though that may be an unclean exit from less not fully resetting the terminal parser state.
Thanks for identifying the issue though @DHowett!
@DHowett commented on GitHub (May 13, 2025):
So, the problem isn't one of getting the cursor position right inside terminal, it's communicating it to the shell. Moving the cursor ourselves is easy: we don't even need to write output for it. Moving it under the nose of the active line editor will, however, break that line editor terribly.
We have to let the shell in on the trick and get it to move the cursor so it can keep its document model in sync. Most such line editors are only expecting a handful of input sequences, and
CUPis definitely not one of them. 🙂This feature is a stopgap built to serve when shells don't have mouse support, so it has to make some assumptions. If we could write CUP and get shells to handle it, we could probably just get them to handle mouse input directly too.
@zadjii-msft commented on GitHub (Aug 13, 2025):
Oh hey look this is /dup #17803
@microsoft-github-policy-service[bot] commented on GitHub (Aug 13, 2025):
Hi! We've identified this issue as a duplicate of another one that already exists on this Issue Tracker. This specific instance is being closed in favor of tracking the concern over on the referenced thread. Thanks for your report!