Author: Michal Srb <msrb@suse.com>
Subject: Do not send ascii control characters for CTRL+[A-Z] combinations.
Patch-Mainline: To be upstreamed
References: bnc#864666

Index: vncviewer/Viewport.cxx
===================================================================
--- vncviewer/Viewport.cxx.orig
+++ vncviewer/Viewport.cxx
@@ -1044,7 +1044,13 @@ rdr::U32 Viewport::translateKeyEvent(voi
     return NoSymbol;
   }
 
-  ucs = fl_utf8decode(keyText, NULL, NULL);
+  if (keyCode >= 'a' && keyCode <= 'z' && keyText[0] < 0x20) {
+    // Do not send ascii control characters - send the original key combination that caused them.
+    ucs = keyCode;
+  } else {
+    ucs = fl_utf8decode(keyText, NULL, NULL);
+  }
+
   return ucs2keysym(ucs);
 }