Merge branch 'js/fix-open-exec-git'

This addresses CVE-2025-46835, Git GUI can create and overwrite a
user's files:

When a user clones an untrusted repository and is tricked into editing
a file located in a maliciously named directory in the repository, then
Git GUI can create and overwrite files for which the user has write
permission.

* js/fix-open-exec-git:
  git-gui: sanitize 'exec' arguments: convert new 'cygpath' calls
  git-gui: do not mistake command arguments as redirection operators
  git-gui: introduce function git_redir for git calls with redirections
  git-gui: pass redirections as separate argument to git_read
  git-gui: pass redirections as separate argument to _open_stdout_stderr
  git-gui: convert git_read*, git_write to be non-variadic
  git-gui: use git_read in githook_read
  git-gui: break out a separate function git_read_nice
  git-gui: remove option --stderr from git_read
  git-gui: sanitize 'exec' arguments: background
  git-gui: sanitize 'exec' arguments: simple cases
  git-gui: treat file names beginning with "|" as relative paths
  git-gui: remove git config --list handling for git < 1.5.3
  git-gui: remove HEAD detachment implementation for git < 1.5.3
  git-gui: remove Tcl 8.4 workaround on 2>@1 redirection

Signed-off-by: Johannes Sixt <j6t@kdbg.org>

diff --cc git-gui.sh
Simple merge

diff --cc lib/commit.tcl
Simple merge

diff --cc lib/console.tcl
index fafafb81f1269c1a1a130f66c335f7d4a6f27bb9,4715ce91e678876e7c374e236677f929c1242b7c..a017cfeaddd8786cac2c99f7b520ab4727894ce4
--- 1/lib/console.tcl
--- 2/lib/console.tcl
+++ b/lib/console.tcl
@@@ -92,12 -92,11 +92,11 @@@ method _init {} 
  
  method exec {cmd {after {}}} {
        if {[lindex $cmd 0] eq {git}} {
-               set fd_f [eval git_read --stderr [lrange $cmd 1 end]]
+               set fd_f [git_read [lrange $cmd 1 end] [list 2>@1]]
        } else {
-               lappend cmd 2>@1
-               set fd_f [_open_stdout_stderr $cmd]
+               set fd_f [safe_open_command $cmd [list 2>@1]]
        }
 -      fconfigure $fd_f -blocking 0 -translation binary
 +      fconfigure $fd_f -blocking 0 -translation binary -encoding [encoding system]
        fileevent $fd_f readable [cb _read $fd_f $after]
  }
  

diff --cc lib/diff.tcl
Simple merge

diff --cc lib/mergetool.tcl
Simple merge