Windows: product names, the editors, WSL; the Linux page's image step

Assembled from development commit c3c40f6c8fca. Since 830b193: on Windows the
products carry Windows names (ktext.exe, klammertext.dll, document.dll,
reflect.dll) and the console's output code page is UTF-8 for a run; the
editor tooling works on Windows (VS Code, Sublime Text, Vim, with the
interpreter's name chosen by platform) and Notepad++ joins it
(doc/edit/notepadpp: a User Defined Language and two Run-menu commands);
a sixth install page, doc/install/windows_wsl_install.md, for Linux
inside WSL; the Windows page opens with the three routes and gains its
editor section, the PowerShell quoting and Path notes; the Linux page
installs OpenImageIO from the python3-openimageio package and verifies
with kdiag --machine; the README lists all six install pages. Linux and
macOS behaviour is unchanged.

tst/editor_test.sh

@@ -59,6 +59,17 @@ FIX="$HERE/editor"
 OUT="$(mktemp -d)"
 trap 'rm -rf "$OUT"' EXIT
 
+# A path written INSIDE a Python string must be one the interpreter can open.
+# Under MSYS2 the shell's /c/... form is converted only for standalone
+# arguments to a native program, never inside a string, so those get the
+# Windows form (forward slashes; a backslash in a Python literal is an escape).
+native() {
+    if command -v cygpath >/dev/null 2>&1; then cygpath -m "$1"; else printf '%s' "$1"; fi
+}
+SHARED_NATIVE="$(native "$SHARED_DIR")"
+SUBLIME_NATIVE="$(native "$SUBLIME_DIR")"
+OUT_NATIVE="$(native "$OUT")"
+
 INDENT_FIXTURES="indent_list indent_document indent_table indent_untouched
                  indent_defs indent_escapes indent_named_close indent_literal_c"
 ALIGN_FIXTURES="align_mixed align_empty_cells align_boundary align_colspan
@@ -105,10 +116,10 @@ fi
 
 # --- the Sublime adapters resolve to the shared core -----------------------
 if PYTHONDONTWRITEBYTECODE=1 "$PYTHON" -c "
-import sys
-sys.path.insert(0, '$SUBLIME_DIR')
+import os, sys
+sys.path.insert(0, '$SUBLIME_NATIVE')
 import Klammertext, Klammertext_indent, Klammertext_align
-assert Klammertext.KE.__file__.startswith('$SHARED_DIR')
+assert os.path.normpath(Klammertext.KE.__file__).startswith(os.path.normpath('$SHARED_NATIVE'))
 " 2>"$OUT/sublime.log"; then
     echo "${green}PASS${reset} sublime adapters import the shared core"
     PASS=$((PASS + 1))
@@ -118,6 +129,25 @@ else
     FAIL=$((FAIL + 1))
 fi
 
+# --- the Notepad++ UDL: well-formed, and it restates the literal klammer -----
+# (a static artifact of the SYNC set; nothing else can check it)
+if PYTHONDONTWRITEBYTECODE=1 "$PYTHON" -c "
+import sys, xml.etree.ElementTree as ET
+u = ET.parse('$(native "$EDIT_DIR")/notepadpp/Klammertext.udl.xml').getroot().find('UserLang')
+assert u.get('name') == 'Klammertext' and set(u.get('ext').split()) == {'kt', 'k'}, u.attrib
+lists = {k.get('name'): (k.text or '') for k in u.find('KeywordLists')}
+assert '00@code' in lists['Delimiters'].split() and '02code@' in lists['Delimiters'].split(), lists['Delimiters']
+assert lists['Keywords1'].strip() == '@@@' and lists['Keywords2'].strip() == '@@' and lists['Keywords3'].strip() == '@'
+assert '03#[' in lists['Comments'].split() and '04]#' in lists['Comments'].split()
+" 2>"$OUT/udl.log"; then
+    echo "${green}PASS${reset} notepad++ UDL is well-formed and restates the literal klammer"
+    PASS=$((PASS + 1))
+else
+    echo "${red}FAIL${reset} notepad++ UDL is well-formed and restates the literal klammer"
+    cat "$OUT/udl.log"
+    FAIL=$((FAIL + 1))
+fi
+
 # --- the language server protocol test -------------------------------------
 if PYTHONDONTWRITEBYTECODE=1 "$PYTHON" "$FIX/ls_test.py" "$SHARED_DIR" "$FIX" >"$OUT/ls.log" 2>&1; then
     echo "${green}PASS${reset} language server protocol ($(grep -c '^PASS' "$OUT/ls.log") checks)"
@@ -230,17 +260,29 @@ else
 fi
 
 # --- the VS Code extension (optional: needs a Node runtime) ----------------
-# node itself, or VS Code's Electron binary run as Node.
+# node itself, or VS Code's Electron binary run as Node, wherever an
+# installed VS Code keeps it: the Linux package, the macOS app bundle, the
+# Windows per-user install (LOCALAPPDATA is a Windows variable, so the shell
+# is MSYS2 there and cygpath exists).
+CODE_BIN=""
+if [ -x /usr/share/code/code ]; then
+    CODE_BIN=/usr/share/code/code
+elif [ -x "/Applications/Visual Studio Code.app/Contents/MacOS/Electron" ]; then
+    CODE_BIN="/Applications/Visual Studio Code.app/Contents/MacOS/Electron"
+elif [ -n "$LOCALAPPDATA" ] && command -v cygpath >/dev/null 2>&1; then
+    c="$(cygpath -u "$LOCALAPPDATA")/Programs/Microsoft VS Code/Code.exe"
+    [ -x "$c" ] && CODE_BIN="$c"
+fi
 run_node() {
     if command -v node >/dev/null 2>&1; then
         node "$@"
-    elif [ -x /usr/share/code/code ]; then
-        ELECTRON_RUN_AS_NODE=1 /usr/share/code/code "$@"
+    elif [ -n "$CODE_BIN" ]; then
+        ELECTRON_RUN_AS_NODE=1 "$CODE_BIN" "$@"
     else
         return 127
     fi
 }
-if command -v node >/dev/null 2>&1 || [ -x /usr/share/code/code ]; then
+if command -v node >/dev/null 2>&1 || [ -n "$CODE_BIN" ]; then
     if run_node "$FIX/vscode_ext_test.js" "$EDIT_DIR/vscode" "$FIX" >"$OUT/vscode.log" 2>&1; then
         echo "${green}PASS${reset} vscode extension ($(grep -c '^PASS' "$OUT/vscode.log") checks)"
         PASS=$((PASS + 1))
@@ -260,7 +302,7 @@ cp -R "$EDIT_DIR/vscode" "$EDIT_DIR/shared" "$OUT/vsix/"
 if ( cd "$OUT/vsix/vscode" && ./make_vsix.sh >/dev/null 2>&1 ) && \
    PYTHONDONTWRITEBYTECODE=1 "$PYTHON" -c "
 import sys, zipfile
-names = set(zipfile.ZipFile('$OUT/vsix/vscode/klammertext.vsix').namelist())
+names = set(zipfile.ZipFile('$OUT_NATIVE/vsix/vscode/klammertext.vsix').namelist())
 need = {'extension.vsixmanifest', '[Content_Types].xml',
         'extension/package.json', 'extension/extension.js',
         'extension/language-configuration.json', 'extension/README.md',