updated for version 7.3.456

Problem:    ":tab drop file" has several problems, including moving the
            current window and opening a new tab for a file that already has a
            window.
Solution:   Refactor ":tab drop" handling. (Hirohito Higashi)

src/testdir/test62.in

@@ -50,6 +50,43 @@ STARTTEST
 :call append(line('$'), test_status)
 :"
 :"
+:" Test for ":tab drop exist-file" to keep current window.
+:sp test1
+:tab drop test1
+:let test_status = 'tab drop 1: fail'
+:if tabpagenr('$') == 1 && winnr('$') == 2 && winnr() == 1
+:    let test_status = 'tab drop 1: pass'
+:endif
+:close
+:call append(line('$'), test_status)
+:"
+:"
+:" Test for ":tab drop new-file" to keep current window of tabpage 1.
+:split
+:tab drop newfile
+:let test_status = 'tab drop 2: fail'
+:if tabpagenr('$') == 2 && tabpagewinnr(1, '$') == 2 && tabpagewinnr(1) == 1
+:    let test_status = 'tab drop 2: pass'
+:endif
+:tabclose
+:q
+:call append(line('$'), test_status)
+:"
+:"
+:" Test for ":tab drop multi-opend-file" to keep current tabpage and window.
+:new test1
+:tabnew
+:new test1
+:tab drop test1
+:let test_status = 'tab drop 3: fail'
+:if tabpagenr() == 2 && tabpagewinnr(2, '$') == 2 && tabpagewinnr(2) == 1
+:    let test_status = 'tab drop 3: pass'
+:endif
+:tabclose
+:q
+:call append(line('$'), test_status)
+:"
+:"
 :/^Results/,$w! test.out
 :qa!
 ENDTEST

src/testdir/test62.ok

@@ -5,3 +5,6 @@ this is tab page 1
 this is tab page 4
 gettabvar: pass
 settabvar: pass
+tab drop 1: pass
+tab drop 2: pass
+tab drop 3: pass