vim-patch:8.1.1175: no test for dragging a tab and double click for new tab

Problem:    No test for dragging a tab with the mouse and for creating a new
            tab by double clicking in the tabline.
Solution:   Add two tests. (Dominique Pelle, closes vim/vim#4258)

e3e3828f93

Set 'mousetime' to 0 instead.

Co-authored-by: Bram Moolenaar <Bram@vim.org>

test/old/testdir/test_termcodes.vim

@@ -261,6 +261,104 @@ func Test_xterm_mouse_click_X_to_close_tab()
   " let &ttymouse = save_ttymouse
 endfunc
 
+func Test_xterm_mouse_drag_to_move_tab()
+  let save_mouse = &mouse
+  let save_term = &term
+  " let save_ttymouse = &ttymouse
+  " Set 'mousetime' to 1 to avoid recognizing a double-click in the loop
+  " set mouse=a term=xterm mousetime=1
+  set mouse=a mousetime=0
+  let row = 1
+
+  for ttymouse_val in ['sgr']
+    " exe 'set ttymouse=' . ttymouse_val
+    e Xtab1
+    tabnew Xtab2
+
+    let a = split(execute(':tabs'), "\n")
+    call assert_equal(['Tab page 1',
+        \              '#   Xtab1',
+        \              'Tab page 2',
+        \              '>   Xtab2'], a)
+    redraw
+
+    " Click in tab2 and drag it to tab1.
+    " Check getcharmod() to verify that click is not
+    " interpreted as a spurious double-click.
+    call MouseLeftClick(row, 10)
+    call assert_equal(0, getcharmod())
+    for col in [9, 8, 7, 6]
+      call MouseLeftDrag(row, col)
+    endfor
+    call MouseLeftRelease(row, col)
+    let a = split(execute(':tabs'), "\n")
+    call assert_equal(['Tab page 1',
+        \              '>   Xtab2',
+        \              'Tab page 2',
+        \              '#   Xtab1'], a)
+
+    %bwipe!
+  endfor
+
+  let &mouse = save_mouse
+  " let &term = save_term
+  " let &ttymouse = save_ttymouse
+  set mousetime&
+endfunc
+
+func Test_xterm_mouse_double_click_to_create_tab()
+  let save_mouse = &mouse
+  let save_term = &term
+  " let save_ttymouse = &ttymouse
+  " Set 'mousetime' to a small value, so that double-click works but we don't
+  " have to wait long to avoid a triple-click.
+  " set mouse=a term=xterm mousetime=100
+  set mouse=a mousetime=100
+  let row = 1
+  let col = 10
+
+  for ttymouse_val in ['sgr']
+    " exe 'set ttymouse=' . ttymouse_val
+    e Xtab1
+    tabnew Xtab2
+
+    let a = split(execute(':tabs'), "\n")
+    call assert_equal(['Tab page 1',
+        \              '#   Xtab1',
+        \              'Tab page 2',
+        \              '>   Xtab2'], a)
+
+    redraw
+    call MouseLeftClick(row, col)
+    " Check getcharmod() to verify that first click is not
+    " interpreted as a spurious double-click.
+    call assert_equal(0, getcharmod())
+    call MouseLeftRelease(row, col)
+    call MouseLeftClick(row, col)
+    call assert_equal(32, getcharmod()) " double-click
+    call MouseLeftRelease(row, col)
+    let a = split(execute(':tabs'), "\n")
+    call assert_equal(['Tab page 1',
+        \              '    Xtab1',
+        \              'Tab page 2',
+        \              '>   [No Name]',
+        \              'Tab page 3',
+        \              '#   Xtab2'], a)
+
+    if ttymouse_val !=# 'sgr'
+      " We need to sleep, or else MouseLeftClick() in next loop
+      " iteration will be interpreted as a spurious triple-click.
+      sleep 100m
+    endif
+    %bwipe!
+  endfor
+
+  let &mouse = save_mouse
+  " let &term = save_term
+  " let &ttymouse = save_ttymouse
+  set mousetime&
+endfunc
+
 " Test for translation of special key codes (<xF1>, <xF2>, etc.)
 func Test_Keycode_Translation()
   let keycodes = [