Merge pull request #1869 from rstudio/fix/positron-restart

Fixes Positron restart

Author: t-kalinowski

R/thread.R

@@ -62,6 +62,9 @@ py_run_file_on_thread <- function(file, ..., args = NULL) {
                     basename(dirname(file)) %in% c("positron", "posit"))
 
   if (launching_lsp) {
+    # this is equivalent to the result of .getIpykernelPath UI command.
+    .globals$positron_ipykernel_path <- file.path(dirname(file), "positron")
+
     main_dict <- py_eval("__import__('__main__').__dict__.copy()", FALSE)
     py_get_attr(main_dict, "pop")("__annotations__")
     # IPykernel will create a thread that redirects all output from fileno of

R/zzz.R

@@ -89,7 +89,9 @@ register_ark_methods <- function() {
   # which will be needed for the variable inspectors and for help handlers
   # this can'rt be executed during handling of RPC's, so it's important that it's cached.
   .ps.ui.executeCommand <- get(".ps.ui.executeCommand", globalenv())
-  .globals$positron_ipykernel_path <- .ps.ui.executeCommand("positron.reticulate.getIPykernelPath")
+  if (is.null(.globals$positron_ipykernel_path)) {
+    .globals$positron_ipykernel_path <- .ps.ui.executeCommand("positron.reticulate.getIPykernelPath")
+  }
 
   # register help handler
   tryCatch({