On 22/09/2022 9:48 a.m., Andrew Hart via R-devel wrote:
Hi. I'm having an issue with R 4.2.1 on Windows but I'm not sure if this
is the right place to ask about it. If it's not, I'm hoping someone can
point me in the right direction.
I'm blind and have been using R for about 11 years now. The base build
available on CRAN is quite accessible and works pretty well with
screen-reading software such as JAWS for Windows and NVDA. R-studio is
not accessible which appears to have something to do with the version of
QT it uses, but that's not relevant as I don't use it.
I believe RStudio is in the process of moving away from QT to Electron.
I don't know when the non-QT version will be released (if not
already), but you might want to investigate that if Rgui doesn't work out.
Duncan Murdoch
Recently I installed R 4.2.1 (I tend to upgrade two or three times a
year and this time I was jumping from R 4.1.2 to 4.2.1).
However, I've encountered a serious problem which makes the latest
version more or less unusable for doing any kind of serious work.
The issue is that the screen-reading software is unable to locate the R
cursor and behaves as though the cursor is near the top left of the R
application window. Practically, this means I can't tell what characters
I'm passing over when cursoring left and right, nor can I hear what
character is being deleted when the backspace is pressed. Most
importantly, I can't tell where the insertion point is. This is a major
regression in the ability to work with and edit the command line in the
R console. There are ways of actually viewing the command line but the
way I work is frequently calling up a previous command and making a
change so as to not have to type the whole command again.
I Went and installed R 4.1.3 and R 4.2.0 in an attempt to find out
exactly when things went awry and the issue first appeared in R 4.2.0.
Looking through the release notes, the only things mentioned that seem
likely to be relevant are the following:
• R uses a new 64-bit Tcl/Tk bundle. The previous 32-bit/64-bit bundle
had a different layout and can no longer be used.
and
• R uses UTF-8 as the native encoding on recent Windows systems (at
least Windows 10 version 1903, Windows Server 2022 or Windows Server
1903). As a part
of this change, R uses UCRT as the C runtime. UCRT should be installed
manually on systems older than Windows 10 or Windows Server 2016 before
installing
R.
I can't really see how changing to utf-8 as the native encoding would
produce the behaviour I'm seeing, so I am guessing that the change in
TCL/TK might be the culprit.
I'm hoping that someone will be able to help shed some light on what's
going on here.
Thanks a lot,
Andrew.
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