patch 8.2.5001: checking translations affects the search pattern history

Problem:    Checking translations affects the search pattern history.
Solution:   Use "keeppatterns". (Doug Kearns)

src/po/check.vim

@@ -38,7 +38,7 @@ set nowrapscan
 " Start at the first "msgid" line.
 let wsv = winsaveview()
 1
-/^msgid\>
+keeppatterns /^msgid\>
 
 " When an error is detected this is set to the line number.
 " Note: this is used in the Makefile.
@@ -101,7 +101,7 @@ while 1
 
   " Find next msgid.  Quit when there is no more.
   let lnum = line('.')
-  silent! /^msgid\>
+  silent! keeppatterns /^msgid\>
   if line('.') == lnum
     break
   endif
@@ -134,7 +134,7 @@ endfunc
 " Check that the \n at the end of the msgid line is also present in the msgstr
 " line.  Skip over the header.
 1
-/^"MIME-Version:
+keeppatterns /^"MIME-Version:
 while 1
   let lnum = search('^msgid\>')
   if lnum <= 0

src/version.c

@@ -734,6 +734,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    5001,
 /**/
     5000,
 /**/