patch 8.2.4702: C++ scope labels are hard-coded

Problem:    C++ scope labels are hard-coded.
Solution:   Add 'cinscopedecls' to define the labels. (Rom Praschan,
            closes #10109)

runtime/doc/indent.txt

@@ -42,11 +42,12 @@ is not a C compiler: it does not recognize all syntax.  One requirement is
 that toplevel functions have a '{' in the first column.  Otherwise they are
 easily confused with declarations.
 
-These four options control C program indenting:
+These five options control C program indenting:
 'cindent'	Enables Vim to perform C program indenting automatically.
 'cinkeys'	Specifies which keys trigger reindenting in insert mode.
 'cinoptions'	Sets your preferred indent style.
 'cinwords'	Defines keywords that start an extra indent in the next line.
+'cinscopedecls'	Defines strings that are recognized as a C++ scope declaration.
 
 If 'lisp' is not on and 'equalprg' is empty, the "=" operator indents using
 Vim's built-in algorithm rather than calling an external program.
@@ -293,8 +294,9 @@ The examples below assume a 'shiftwidth' of 4.
 <
 							*cino-g*
 	gN    Place C++ scope declarations N characters from the indent of the
-	      block they are in.  (default 'shiftwidth').  A scope declaration
-	      can be "public:", "protected:" or "private:".
+	      block they are in.  (default 'shiftwidth'). By default, a scope 
+	      declaration is "public:", "protected:" or "private:". This can
+	      be adjusted with the 'cinscopedecls' option.
 
 		cino=		    cino=g0 >
 		  {		      {

runtime/doc/options.txt

@@ -1661,13 +1661,23 @@ A jump table for the options with a short description can be found at |Q_op|.
 	matter, include the keyword both the uppercase and lowercase:
 	"if,If,IF".
 
-						*'clipboard'* *'cb'*
+						*'cinscopedecls'* *'cinsd'*
+'cinscopedecls' 'cinsd'	string	(default "public,protected,private")
+			local to buffer
+			{not available when compiled without the |+cindent|
+			feature}
+	Keywords that are interpreted as a C++ scope declaration by |cino-g|.
+	Useful e.g. for working with the Qt framework that defines additional
+	scope declarations "signals", "public slots" and "private slots": >
+		set cinscopedecls+=signals,public\ slots,private\ slots
+
+<						*'clipboard'* *'cb'*
 'clipboard' 'cb'	string	(default "autoselect,exclude:cons\|linux"
 						  for X-windows, "" otherwise)
 			global
 			{only in GUI versions or when the |+xterm_clipboard|
 			feature is included}
-	This option is a list of comma separated names.
+	This option is a list of comma-separated names.
 	Note: if one of the items is "exclude:", then you can't add an item
 	after that.  Therefore do append an item with += but use ^= to
 	prepend, e.g.: >

runtime/doc/quickref.txt

@@ -643,6 +643,7 @@ Short explanation of each option:		*option-list*
 'cinkeys'	  'cink'    keys that trigger indent when 'cindent' is set
 'cinoptions'	  'cino'    how to do indenting when 'cindent' is set
 'cinwords'	  'cinw'    words where 'si' and 'cin' add an indent
+'cinscopedecls'	  'cinsd'   words that are recognized by 'cino-g' 
 'clipboard'	  'cb'	    use the clipboard as the unnamed register
 'cmdheight'	  'ch'	    number of lines to use for the command-line
 'cmdwinheight'	  'cwh'     height of the command-line window

runtime/optwin.vim

@@ -624,6 +624,8 @@ call <SID>BinOptionG("scf", &scf)
 if has("gui")
   call <SID>AddOption("mousehide", gettext("hide the mouse pointer while typing"))
   call <SID>BinOptionG("mh", &mh)
+  call <SID>AddOption("mousemoveevent", gettext("report mouse movement events"))
+  call <SID>BinOptionG("mousemev", &mousemev)
 endif
 call <SID>AddOption("mousemodel", gettext("\"extend\", \"popup\" or \"popup_setpos\"; what the right\nmouse button is used for"))
 call <SID>OptionG("mousem", &mousem)
@@ -927,6 +929,9 @@ if has("cindent")
   call <SID>AddOption("cinwords", gettext("list of words that cause more C-indent"))
   call append("$", "\t" .. s:local_to_buffer)
   call <SID>OptionL("cinw")
+  call <SID>AddOption("cinscopedecls", gettext("list of scope declaration names used by cino-g"))
+  call append("$", "\t" .. s:local_to_buffer)
+  call <SID>OptionL("cinsd")
   call <SID>AddOption("indentexpr", gettext("expression used to obtain the indent of a line"))
   call append("$", "\t" .. s:local_to_buffer)
   call <SID>OptionL("inde")