Correct doc strings for x-*-keysym

* src/xterm.c (syms_of_xterm): Clarify whether x-*-keysym
affects the modifier key reported for a keysym or the other way
around.

(cherry picked from commit 4d03f70b7f01477a8d72f827ba8b0dabba8c0a61)

diff --git a/src/xterm.c b/src/xterm.c
index c8a43785564dd523732d8e154aa9b129524342bc..bebc30c910310fcb25622c50fe8f57a547542692 100644 (file)
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -32536,38 +32536,40 @@ Android does not support scroll bars at all.  */);
   DEFSYM (Qreally_fast, "really-fast");
 
   DEFVAR_LISP ("x-ctrl-keysym", Vx_ctrl_keysym,
-    doc: /* Which keys Emacs uses for the ctrl modifier.
-This should be one of the symbols `ctrl', `alt', `hyper', `meta',
-`super'.  For example, `ctrl' means use the Ctrl_L and Ctrl_R keysyms.
-The default is nil, which is the same as `ctrl'.  */);
+    doc: /* Which modifer value Emacs reports when Ctrl is depressed.
+This should be one of the symbols `ctrl', `alt', `hyper', `meta', or
+`super', representing a modifier to be reported in key events with the
+Ctrl modifier (i.e. the keysym Ctrl_L or Ctrl_R) depressed.  */);
   Vx_ctrl_keysym = Qnil;
 
   DEFVAR_LISP ("x-alt-keysym", Vx_alt_keysym,
-    doc: /* Which keys Emacs uses for the alt modifier.
-This should be one of the symbols `ctrl', `alt', `hyper', `meta',
-`super'.  For example, `alt' means use the Alt_L and Alt_R keysyms.
-The default is nil, which is the same as `alt'.  */);
+    doc: /* Which modifer value Emacs reports when Alt is depressed.
+This should be one of the symbols `ctrl', `alt', `hyper', `meta', or
+`super', representing a modifier to be reported in key events with the
+Alt modifier (e.g. the keysym Alt_L or Alt_R, if the keyboard features a
+dedicated key for Meta) depressed.  */);
   Vx_alt_keysym = Qnil;
 
   DEFVAR_LISP ("x-hyper-keysym", Vx_hyper_keysym,
-    doc: /* Which keys Emacs uses for the hyper modifier.
-This should be one of the symbols `ctrl', `alt', `hyper', `meta',
-`super'.  For example, `hyper' means use the Hyper_L and Hyper_R
-keysyms.  The default is nil, which is the same as `hyper'.  */);
+    doc: /* Which modifer value Emacs reports when Hyper is depressed.
+This should be one of the symbols `ctrl', `alt', `hyper', `meta', or
+`super', representing a modifier to be reported in key events with the
+Hyper modifier (i.e. the keysym Hyper_L or Hyper_R) depressed.  */);
   Vx_hyper_keysym = Qnil;
 
   DEFVAR_LISP ("x-meta-keysym", Vx_meta_keysym,
-    doc: /* Which keys Emacs uses for the meta modifier.
-This should be one of the symbols `ctrl', `alt', `hyper', `meta',
-`super'.  For example, `meta' means use the Meta_L and Meta_R keysyms.
-The default is nil, which is the same as `meta'.  */);
+    doc: /* Which modifer value Emacs reports when Meta is depressed.
+This should be one of the symbols `ctrl', `alt', `hyper', `meta', or
+`super', representing a modifier to be reported in key events with the
+Meta modifier (e.g. the keysym Alt_L or Alt_R, when the keyboard does
+not feature a dedicated key for Meta) depressed.  */);
   Vx_meta_keysym = Qnil;
 
   DEFVAR_LISP ("x-super-keysym", Vx_super_keysym,
-    doc: /* Which keys Emacs uses for the super modifier.
-This should be one of the symbols `ctrl', `alt', `hyper', `meta',
-`super'.  For example, `super' means use the Super_L and Super_R
-keysyms.  The default is nil, which is the same as `super'.  */);
+    doc: /* Which modifer value Emacs reports when Super is depressed.
+This should be one of the symbols `ctrl', `alt', `hyper', `meta', or
+`super', representing a modifier to be reported in key events with the
+Super modifier (i.e. the keysym Super_L or Super_R) depressed.  */);
   Vx_super_keysym = Qnil;
 
   DEFVAR_LISP ("x-wait-for-event-timeout", Vx_wait_for_event_timeout,