[R-SIG-Mac] Minor bug in R.app GUI

[Duncan Murdoch]

When running in R.app (sessionInfo below; this is not quite the latest, 
sorry) I see the following minor issue:

When typing in the console, entering an opening paren causes the GUI to 
insert a matching closing paren.  When it does this, the text in the 
display all drops down half a line.  As soon as I type anything else, it 
pops back up.

Duncan Murdoch

Sessioninfo:


R version 4.0.5 Patched (2021-04-30 r80294)
Platform: x86_64-apple-darwin17.0 (64-bit)
Running under: macOS Catalina 10.15.7

Matrix products: default
BLAS: 
/Library/Frameworks/R.framework/Versions/4.0/Resources/lib/libRblas.dylib
LAPACK: 
/Library/Frameworks/R.framework/Versions/4.0/Resources/lib/libRlapack.dylib

locale:
[1] en_CA.UTF-8/en_CA.UTF-8/en_CA.UTF-8/C/en_CA.UTF-8/en_CA.UTF-8

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

loaded via a namespace (and not attached):
[1] compiler_4.0.5