bug#29680: 24.5; find-grep not finding a file or missing the grep

[Donald H Locker]

The particular bug is not easy to reproduce (yet) and I don't have an
example I can actually send.

`M-x find-grep` (aka `grep-find`), then:

    find . -type f -name '*-2017-12-12_09.22.57.log' -exec grep -nHE 
'ERROR:' {} \;

finds a number of ERROR: lines in various `.log` files at various depths 
in the directory hierarchy where I am working.

One particular file with an 'ERROR:'

    ./PFF/PFF/PFF.bat-2017-12-12_09.22.57.log

is not found unless I change down a directory level, starting in 
`./PFF`, or unless the parent directory name is [at least] one character 
longer or shorter (but see below.) e.g. the ERROR: line is found in

    ./PFF/PFFm/PFF.bat-2017-12-12_09.22.57.log

or in

    ./PFF/PFF-/PFF.bat-2017-12-12_09.22.57.log

but never in

    ./PFF/PFF/PFF.bat-2017-12-12_09.22.57.log

whether the original `./PFF/PFF` directory is renamed or copied to a 
[longer-named] parent (when copied, I have both `./PFF/PFF` and 
`./PFF/PFFx` directories.)

Then it gets weird - if I have a copy of the `./PFF/PFF` directory named 
`./PFF/PF` or `./PFF/P`, the `ERROR:` lines in both copies of the `.log` 
file are found (one in each of the directories;) if the duplicate 
directory is named with three or more characters (e.g. `./PFF/PFM`) the 
original `./PFF/PFF` log file is not found (or grepped; not sure yet 
which.) Simply creating a `./PFF/PF` directory does not work; it has to 
be populated with [at least some] of the same files found in `./PFF/PFF`

It might be worth mentioning that the `./PFF` directory does have two 
other subdirs in addition to `./PFF/PFF` (`./PFF/PFF_FILE_HANDLING` and 
`./PFF/PFF_CAPTURE_FF`) so it doesn't appear that the problem is that 
`./PFF/PFF` is all alone.

    find . -type f -name '*-2017-12-12_09.22.57.log' -exec grep -nHE 
'ERROR:' {} \;

at the command line works as expected.



In GNU Emacs 24.5.1 (i686-pc-mingw32)
 of 2015-04-11 on LEG570
Windowing system distributor `Microsoft Corp.', version 6.1.7601
Configured using:
 `configure --prefix=/c/usr --host=i686-pc-mingw32'

Important settings:
  value of $LANG: ENU
  locale-coding-system: cp1252

Major mode: Dired by date

Minor modes in effect:
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  show-paren-mode: t
  savehist-mode: t
  desktop-save-mode: t
  tooltip-mode: t
  electric-indent-mode: t
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  auto-compression-mode: t
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Recent messages:
Wrote 
c:/workingSVN/cr17935-dolly-port-1/testing/VectorCAST/openecu-unit-test/environment/PFF/PFF/PFF.bat
Directory has changed on disk; type g to update Dired
Mark saved where search started
Mark set
Deleting...done
Mark saved where search started
Mark set
Mark saved where search started
Making completion list... [6 times]
Note: file is write protected

Load-path shadows:
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Memory information:
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