Fix lost menu clicks on icons when window partly off screen

Detail:
  Don't trap menu clicks on icons when the window isn't fully on-screen.
  Ref https://www.riscosopen.org/forum/forums/4/topics/14961?page=1
Admin:
  Submission for Clipboard Support bounty.

Version 5.68. Tagged as 'Wimp-5_68'

VersionASM

@@ -9,12 +9,12 @@
                         GBLS    Module_ApplicationDate
                         GBLS    Module_HelpVersion
                         GBLS    Module_ComponentName
-Module_MajorVersion     SETS    "5.67"
-Module_Version          SETA    567
+Module_MajorVersion     SETS    "5.68"
+Module_Version          SETA    568
 Module_MinorVersion     SETS    ""
 Module_Date             SETS    "04 Jan 2020"
 Module_ApplicationDate  SETS    "04-Jan-20"
 Module_ComponentName    SETS    "Wimp"
-Module_FullVersion      SETS    "5.67"
-Module_HelpVersion      SETS    "5.67 (04 Jan 2020)"
+Module_FullVersion      SETS    "5.68"
+Module_HelpVersion      SETS    "5.68 (04 Jan 2020)"
                         END

VersionNum

-/* (5.67)
+/* (5.68)
  *
  * This file is automatically maintained by srccommit, do not edit manually.
  *
  */
-#define Module_MajorVersion_CMHG        5.67
+#define Module_MajorVersion_CMHG        5.68
 #define Module_MinorVersion_CMHG        
 #define Module_Date_CMHG                04 Jan 2020
 
-#define Module_MajorVersion             "5.67"
-#define Module_Version                  567
+#define Module_MajorVersion             "5.68"
+#define Module_Version                  568
 #define Module_MinorVersion             ""
 #define Module_Date                     "04 Jan 2020"
 
@@ -16,6 +16,6 @@
 
 #define Module_ComponentName            "Wimp"
 
-#define Module_FullVersion              "5.67"
-#define Module_HelpVersion              "5.67 (04 Jan 2020)"
-#define Module_LibraryVersionInfo       "5:67"
+#define Module_FullVersion              "5.68"
+#define Module_HelpVersion              "5.68 (04 Jan 2020)"
+#define Module_LibraryVersionInfo       "5:68"

s/Wimp03

@@ -2350,6 +2350,8 @@ justtellhim
         [ CnP
         CMP     R4,#0
         BMI     %FT00                   ; not over an icon, so no point checking on cnpwritable actions
+        TST     R2,#2                   ; menu button?
+        BNE     %FT00
         TST     R6,#ibb_cnpwriteable
         BNE     mouseaction_cnpwriteable
 00