patch 8.0.1232: MS-Windows users are confused about default mappings

Problem:    MS-Windows users are confused about default mappings.
Solution:   Don't map keys in the console where they don't work.  Add a choice
            in the installer to use MS-Windows key bindings or not. (Christian
            Brabandt, Ken Takata, closes #2093)

nsis/gvim.nsi

@@ -83,6 +83,7 @@ SilentInstall normal
 # These are the pages we use
 Page license
 Page components
+Page custom SetCustom ValidateCustom ": _vimrc setting"
 Page directory "" "" CheckInstallDir
 Page instfiles
 UninstPage uninstConfirm
@@ -135,6 +136,10 @@ Function .onInit
   StrCpy $1 "-register-OLE"
   StrCpy $2 "gvim evim gview gvimdiff vimtutor"
 
+  # Extract InstallOptions files
+  # $PLUGINSDIR will automatically be removed when the installer closes
+  InitPluginsDir
+  File /oname=$PLUGINSDIR\vimrc.ini "vimrc.ini"
 FunctionEnd
 
 Function .onUserAbort
@@ -404,7 +409,7 @@ Section "Add an Edit-with-Vim context menu entry"
 SectionEnd
 
 ##########################################################
-Section "Create a _vimrc if it doesn't exist"
+Section "Create a _vimrc if it doesn't exist" sec_vimrc_id
 	SectionIn 1 3
 
 	StrCpy $1 "$1 -create-vimrc"
@@ -462,6 +467,45 @@ Section -post
 	BringToFront
 SectionEnd
 
+##########################################################
+Function SetCustom
+	# Display the InstallOptions dialog
+
+	# Check if a _vimrc should be created
+	SectionGetFlags ${sec_vimrc_id} $0
+	IntOp $0 $0 & 1
+	StrCmp $0 "1" +2 0
+	  Abort
+
+	Push $3
+	  InstallOptions::dialog "$PLUGINSDIR\vimrc.ini"
+	  Pop $3
+	Pop $3
+FunctionEnd
+
+Function ValidateCustom
+	ReadINIStr $3 "$PLUGINSDIR\vimrc.ini" "Field 2" "State"
+	StrCmp $3 "1" 0 +3
+	  StrCpy $1 "$1 -vimrc-remap no"
+	  Goto behave
+
+	  StrCpy $1 "$1 -vimrc-remap win"
+
+	behave:
+	ReadINIStr $3 "$PLUGINSDIR\vimrc.ini" "Field 5" "State"
+	StrCmp $3 "1" 0 +3
+	  StrCpy $1 "$1 -vimrc-behave unix"
+	  Goto done
+
+	ReadINIStr $3 "$PLUGINSDIR\vimrc.ini" "Field 6" "State"
+	StrCmp $3 "1" 0 +3
+	  StrCpy $1 "$1 -vimrc-behave mswin"
+	  Goto done
+
+	  StrCpy $1 "$1 -vimrc-behave default"
+	done:
+FunctionEnd
+
 ##########################################################
 Section Uninstall
 	# Apparently $INSTDIR is set to the directory where the uninstaller is

nsis/vimrc.ini

@@ -0,0 +1,68 @@
+[Settings]
+NumFields=7
+
+[Field 1]
+Type=GroupBox
+Left=0
+Right=-1
+Top=0
+Bottom=53
+Text=" Key remapping "
+
+[Field 2]
+Type=radiobutton
+Text=Do not remap keys for Windows behavior (Default)
+Left=10
+Right=-10
+Top=17
+Bottom=25
+State=1
+Flags=GROUP
+
+[Field 3]
+Type=radiobutton
+Text=Remap a few keys for Windows behavior (<C-V>, <C-C>, <C-A>, <C-S>, <C-F>, etc)
+Left=10
+Right=-10
+Top=30
+Bottom=47
+State=0
+Flags=NOTABSTOP
+
+[Field 4]
+Type=GroupBox
+Left=0
+Right=-1
+Top=55
+Bottom=-5
+Text=" Mouse behavior "
+
+[Field 5]
+Type=radiobutton
+Text=Right button extends selection, left button starts visual mode (Unix)
+Left=10
+Right=-5
+Top=72
+Bottom=80
+State=0
+Flags=GROUP
+
+[Field 6]
+Type=radiobutton
+Text=Right button has a popup menu, left button starts select mode (Windows)
+Left=10
+Right=-5
+Top=85
+Bottom=93
+State=0
+Flags=NOTABSTOP
+
+[Field 7]
+Type=radiobutton
+Text=Right button has a popup menu, left button starts visual mode (Default)
+Left=10
+Right=-5
+Top=98
+Bottom=106
+State=1
+Flags=NOTABSTOP