keyboard: Don't clear Control on Control-Alt-Backspace.

x11-misc/xkeyboard-config/files/xkeyboard-config-1.7-backspace-and-arrow-keys.patch

 diff --git a/symbols/pc b/symbols/pc
-index 9f3da66..fb93e7b 100644
+index 9f3da66..bccf56b 100644
 --- a/symbols/pc
 +++ b/symbols/pc
 @@ -19,7 +19,16 @@ xkb_symbols "pc105" {
      include "pc(editing)"
      include "keypad(x11)"
  
 -    key <BKSP> {       [ BackSpace     ]       };
 +    key <BKSP> {
 +        type="CONTROL_ALT",
 +        repeat=yes,
 +        symbols[Group1] = [ BackSpace, Delete, Delete ],
 +        actions[Group1] = [
 +            NoAction(),
 +            RedirectKey(key=<DELE>, clearmods=Alt),
-+            RedirectKey(key=<DELE>, clearmods=Control+Alt)
++            RedirectKey(key=<DELE>, clearmods=Alt)
 +        ]
 +    };
  
      key  <TAB> {       [ Tab,  ISO_Left_Tab    ]       };
      key <RTRN> {       [ Return        ]       };
 @@ -141,9 +150,27 @@ xkb_symbols "editing" {
      key  <END> {       [  End                  ]       };
      key <PGDN> {       [  Next                 ]       };
  
 -    key   <UP> {       [  Up                   ]       };
@@ skipping 45 matching lines @@
 +    type "CONTROL_ALT" {
 +        modifiers              = Alt+Control;
 +        map[None]              = Level1;
 +        map[Alt]               = Level2;
 +        map[Control+Alt]       = Level3;
 +        level_name[Level1]     = "Base";
 +        level_name[Level2]     = "Alt";
 +        level_name[Level3]     = "ControlAlt";
 +    };
  };