Sidebar open/close transition not smooth on RHEL

[al-obrien]

On the latest and dev version of {bslib}, the sidebar is jerky when opening and closing.

I tried this on two systems, one RHEL 8 and another on Windows 10, using similar R versions (4.4.1) and package versions. The one on Linux is jerky, the attempt on Windows 10 performed as normal.

It is easier to show than explain... this is the experience on the Linux machine using the example from the bslib website:

library(shiny)
library(bslib)

ui <- page_sidebar(
  title = "My dashboard",
  sidebar = "Sidebar",
  "Main content area"
)

shinyApp(ui, function(input, output) {})

https://github.com/user-attachments/assets/af95a8cd-95d4-4118-b47e-e5c52f9138fe

Session Info: Linux

R version 4.4.1 (2024-06-14) Platform: x86_64-pc-linux-gnu Running under: Red Hat Enterprise Linux 8.9 (Ootpa)

Matrix products: default BLAS/LAPACK: /usr/lib64/libopenblasp-r0.3.15.so; LAPACK version 3.9.0

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

other attached packages: [1] bslib_0.8.0.9000 shiny_1.9.1

loaded via a namespace (and not attached): [1] vctrs_0.6.5 cli_3.6.3 rlang_1.1.4 promises_1.3.0 jsonlite_1.8.8
[6] xtable_1.8-4 glue_1.7.0 htmltools_0.5.8.1 httpuv_1.6.15 sass_0.4.9
[11] rsconnect_1.3.1 fansi_1.0.6 jquerylib_0.1.4 tibble_3.2.1 fastmap_1.2.0
[16] lifecycle_1.0.4 memoise_2.0.1 compiler_4.4.1 bsicons_0.1.2 fs_1.6.4
[21] pkgconfig_2.0.3 Rcpp_1.0.13 rstudioapi_0.16.0 later_1.3.2 digest_0.6.37
[26] R6_2.5.1 utf8_1.2.4 pillar_1.9.0 magrittr_2.0.3 tools_4.4.1
[31] mime_0.12 cachem_1.1.0

[gadenbuie]

What version of Google Chrome are you using on RHEL? The sidebar transition is a CSS animation and its behavior is ultimately dependent on your browser.

[al-obrien]

I do not have control over the version on this particular machine, but this is what I found:

Version 128.0.6613.138 (Official Build) (64-bit)

One point of clarity, the app is made on RHEL using RStudio Server but viewed in Chrome on a Windows machine.