Text is added on the R console output

System details:

Positron and OS details:

Positron Version: 2026.01.0 build 147
Code - OSS Version: 1.106.0
Commit: 3290136f699527bf01b703b390457b05ef2b858a
Date: 2026-01-06T01:43:52.838Z
Electron: 37.7.0
Chromium: 138.0.7204.251
Node.js: 22.20.0
V8: 13.8.258.32-electron.0
OS: Linux x64 6.17.0-1010-oem

Session details:

R version 4.5.2 (2025-10-31)
Platform: x86_64-pc-linux-gnu
Running under: Slimbook OS # A variant of Ubuntu

Matrix products: default
BLAS:   /usr/lib/x86_64-linux-gnu/openblas-pthread/libblas.so.3 
LAPACK: /usr/lib/x86_64-linux-gnu/openblas-pthread/libopenblasp-r0.3.26.so;  LAPACK version 3.12.0

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C              
 [3] LC_TIME=es_ES.UTF-8        LC_COLLATE=en_US.UTF-8    
 [5] LC_MONETARY=es_ES.UTF-8    LC_MESSAGES=en_US.UTF-8   
 [7] LC_PAPER=es_ES.UTF-8       LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C            
[11] LC_MEASUREMENT=es_ES.UTF-8 LC_IDENTIFICATION=C       

time zone: Europe/Madrid
tzcode source: system (glibc)

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] shiny_1.12.1        rutils_0.0.2.93     rtoot_0.3.6        
[4] devtools_2.4.6      BiocManager_1.30.27 cyclocomp_1.1.1    
[7] testthat_3.3.2      usethis_3.2.1      

loaded via a namespace (and not attached):
 [1] fastmap_1.2.0       gh_1.5.0            promises_1.5.0     
 [4] digest_0.6.39       reprex_2.1.1        mime_0.13          
 [7] lifecycle_1.0.5     waldo_0.6.2         ellipsis_0.3.2     
[10] processx_3.8.6      magrittr_2.0.4      compiler_4.5.2     
[13] sass_0.4.10         rlang_1.1.7         tools_4.5.2        
[16] yaml_2.3.12         data.table_1.18.2.1 knitr_1.51         
[19] askpass_1.2.1       pkgbuild_1.4.8      curl_7.0.0         
[22] xml2_1.5.2          pkgload_1.4.1       miniUI_0.1.2       
[25] withr_3.0.2         purrr_1.2.1         sys_3.4.3          
[28] desc_1.4.3          roxygen2_7.3.3      diffobj_0.3.6      
[31] xtable_1.8-4        gitcreds_0.1.2      cli_3.6.5          
[34] rmarkdown_2.30      crayon_1.5.3        remotes_2.5.0      
[37] otel_0.2.0          rstudioapi_0.18.0   commonmark_2.0.0   
[40] sessioninfo_1.2.3   cachem_1.1.0        stringr_1.6.0      
[43] vctrs_0.7.1         jsonlite_2.0.0      callr_3.7.6        
[46] credentials_2.0.3   jquerylib_0.1.4     clipr_0.8.0        
[49] glue_1.8.0          ps_1.9.1            stringi_1.8.7      
[52] later_1.4.5         tibble_3.3.1        pillar_1.11.1      
[55] htmltools_0.5.9     rappdirs_0.3.4      brio_1.1.5         
[58] openssl_2.3.4       R6_2.6.1            httr2_1.2.2        
[61] gert_2.3.1          rprojroot_2.1.1     evaluate_1.0.5     
[64] memoise_2.0.1       bslib_0.10.0        httpuv_1.6.16      
[67] Rcpp_1.1.1          xfun_0.56           fs_1.6.6           
[70] pkgconfig_2.0.3    

Describe the issue:

The output of the R command is messed up on the console.
This doesn't happen inside reprex/callr or R outside Positron

Steps to reproduce the issue:

Run this reprex on the console with R 4.5.2:

x <- "whatever https://google.com"
xx <- "Google url is https://google.com or http://google.com"
paste0(x, xx, collapse = "*")
#> [1] "whatever https://google.comGoogle url is https://google.com or http://google.com"

^{Created on 2026-01-31 with reprex v2.1.1}

Instead of this you will see:

[1] "whatever https://google.comGooglehttps://google.comGooglehttps://google.comGoogle url is https://google.com or http://google.com"

Expected or desired behavior:

To receive:

#> [1] "whatever https://google.comGoogle url is https://google.com or http://google.com"

Were there any error messages in the UI, Output panel, or Developer Tools console?

Start by reproducing the issue in the R console with the supplied URL-containing string example and compare the displayed output with R outside Positron. Trace the console output handling for this case and verify that the repeated URL and text are removed while the expected output remains unchanged.