make the "Both Alts" option for switching between groups work again

Seemingly unintentionally bundled together with massive OLPC changes,
commit a8551efb70 from fifteen years ago changed the alts_toggle and
ctrls_toggle to use new key types that relied on virtual modifiers,
in order to address issue #122.  But specifying a virtual modifier in
a key assignment does not work, apparenly due to some limitation of
XKM (https://gitlab.freedesktop.org/xorg/xserver/-/issues/297).

It does not look like that limitation will be fixed.  So, let's roll
back the alts_toggle to what it was fifteen years ago when it worked.

This refreshed alts_toggle may cause problems for programs that cannot
cope with an Alt key that produces a different symbol upon key release
than upon key press -- the user will then have to choose a different
option for switching between layouts.

(The ctrls_toggle was restored in commit 4346c44713, six years ago.)

This fixes issue #316.

It also fixes issue #43, reported by Mohammed Adnène Trojette,
originally by Itaï Ben Yaacov in https://bugs.debian.org/463373.

Signed-off-by: Benno Schulenberg <bensberg@telfort.nl>

1 files changed, 4 insertions, 4 deletions

diff --git a/symbols/group b/symbols/group
index 536abc0..62cd301 100644
--- a/symbols/group
+++ b/symbols/group
@@ -349,13 +349,13 @@ partial modifier_keys
 xkb_symbols "alts_toggle" {
     virtual_modifiers LAlt, RAlt;
     key <LALT> {
-        type[Group1]="PC_RALT_LEVEL2",
-        symbols[Group1] = [ NoSymbol, ISO_Prev_Group ],
+        type[Group1]="PC_ALT_LEVEL2",
+        symbols[Group1] = [ Alt_L, ISO_Prev_Group ],
         virtualMods= LAlt
     };
     key <RALT> {
-        type[Group1]="PC_LALT_LEVEL2",
-        symbols[Group1] = [ NoSymbol, ISO_Next_Group ],
+        type[Group1]="PC_ALT_LEVEL2",
+        symbols[Group1] = [ Alt_R, ISO_Next_Group ],
         virtualMods= RAlt
     };
 };