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Subject: |
28.0.50; Emacs Calc selection of a sub-formula doesn't highlight it |
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Date: |
Sun, 22 Mar 2020 19:24:05 +0100 |
+ Start Emacs Calc with `C-x * *`.
+ Enter the following formula with:
' (a + b)^3 / c d
+ Move point to be before "+" and use "j s" to select the
sub-formula "(a + b)".
+ This should have hidden the rest of the formula. But it does
not.
3
(a + b)
1* --------
c d
Selecting a Calc sub-formula doesn't highlight it. For example, in
the stack entry above, I have selected (a + b) but other parts of
the formula are still visible. All commands operate on the
selected formula and it is selected as evident from the '*' after
the number of the stack entry. It is not highlighted. This seems
to be working fine in Emacs 26. It's broken in the latest Emacs
versions: Emacs 27 and Emacs 28. I can confirm that it is not
happening because of any of my configuration because I tried the
same thing with `emacs -Q` and the result was the same.
Best,
--
Narendra Joshi
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--- Begin Message ---
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Subject: |
Re: #40185: 28.0.50; Emacs Calc selection of a sub-formula doesn't highlight it |
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Date: |
Mon, 23 Mar 2020 21:37:40 +0100 |
23 mars 2020 kl. 20.06 skrev Narendra Joshi <address@hidden>:
> Can you please help me
> understand what exactly the issue was and how declaring the variable
> fixed it? I see that it is `defvar`ed in `calc-ext.el`.
'defvar' without an initial value is a declaration scoped to the surrounding
lexical scope (or file, if at top level). It appears that calc.el does not
require calc-ext, so that math-comp-selected was assumed to be lexical where it
was bound in math-format-stack-value. This caused it to have the wrong number
further down the call tree (in math-comp-to-string-flat, I think).
In Emacs 26 and earlier, calc.el used dynamic binding.
Thanks for verifying! Patch pushed to emacs-27.
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