From 046d139492af1efb4adcf27bf13cc20a48c730fb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marcin=20Woli=C5=84ski?= <wolinski@ipipan.waw.pl>
Date: Tue, 17 May 2011 11:19:02 +0200
Subject: [PATCH] Microsoft Windows compatible level 3 switch

On Windows Right Alt is equivalent to the Ctrl+Alt combination and both select level 3. Here we
define only Right Alt and Left Ctrl+Left Alt as level 3 switch leaving Right Ctrl+Right Alt for
accessing Ctrl+Alt shortcuts.

This patch is an unsuccessful attempt.
---
 rules/base.o_s.part |    1 +
 rules/base.xml.in   |    6 ++++++
 symbols/level3      |   21 +++++++++++++++++++++
 3 files changed, 28 insertions(+), 0 deletions(-)

diff --git a/rules/base.o_s.part b/rules/base.o_s.part
index 3e23396..54370f6 100644
--- a/rules/base.o_s.part
+++ b/rules/base.o_s.part
@@ -51,6 +51,7 @@
   lv3:lwin_switch	=	+level3(lwin_switch)
   lv3:rwin_switch	=	+level3(rwin_switch)
   lv3:enter_switch	=	+level3(enter_switch)
+  lv3:mswin_compat	=	+level3(mswin_compat)
   caps:capslock		=	+capslock(capslock)
   caps:numlock		=	+capslock(numlock)
   caps:shiftlock	=	+capslock(shiftlock)
diff --git a/rules/base.xml.in b/rules/base.xml.in
index 33307dd..859e5fe 100644
--- a/rules/base.xml.in
+++ b/rules/base.xml.in
@@ -5563,6 +5563,12 @@
       </option>
       <option>
         <configItem>
+          <name>lv3:mswin_compat</name>
+	  <_description>MS Windows compatible (Right Alt and Left Ctrl+Alt)</_description>
+        </configItem>
+      </option>
+      <option>
+        <configItem>
           <name>lv3:caps_switch_latch</name>
           <_description>Caps Lock (chooses 3rd level, latches when pressed together with another 3rd-level-chooser)</_description>
         </configItem>
diff --git a/symbols/level3 b/symbols/level3
index 9d49555..577e855 100644
--- a/symbols/level3
+++ b/symbols/level3
@@ -194,3 +194,24 @@ xkb_symbols "lsgt_switch_latch" {
   };
   modifier_map Mod5   { ISO_Level3_Shift };
 };
+
+
+// Microsoft Windows compatible right Alt switch:
+// right Alt and left Alt+Ctrl switch to level 3
+//
+partial modifier_keys
+xkb_symbols "mswin_compat" {
+  key <RALT> {
+    type[Group1]="PC_CONTROL_LEVEL2",
+    symbols[Group1]= [ ISO_Level3_Shift, Alt_R ]
+   };
+  key <LALT> {
+    type[Group1]="PC_LCONTROL_LEVEL2",
+    symbols[Group1]= [ Alt_L, ISO_Level3_Shift ]
+  };
+  key <LCTL> {
+    type[Group1]="PC_LALT_LEVEL2",
+    symbols[Group1]= [ Control_L, ISO_Level3_Shift ]
+  };
+//??  modifier_map Mod5   { ISO_Level3_Shift };
+};
-- 
1.7.0.4