several vim tests fail

[dpelle]

Vim tests fail when vim-8.1.2027 is configured as follows:

$ ./configure --with-features=normal --enable-gui=none --enable-terminal
$ make ; make test
...snip..
Executed:  2023 Tests
 Skipped:    47 Tests
  FAILED:     2 Tests


Failures: 
	From test_popupwin.vim:
	Found errors in Test_popup_beval():
	Run 1:
	function RunTheTest[40]..Test_popup_beval[32]..VerifyScreenDump line 55: See dump file difference: call term_dumpdiff("testdir/failed/Test_popupwin_beval_1.dump", "testdir/dumps/Test_popupwin_beval_1.dump"); difference in line 4: "|4| @73"
	function RunTheTest[40]..Test_popup_beval[35]..VerifyScreenDump line 55: See dump file difference: call term_dumpdiff("testdir/failed/Test_popupwin_beval_2.dump", "testdir/dumps/Test_popupwin_beval_2.dump"); difference in line 4: "|4| @73"
	Run 2:
	function RunTheTest[40]..Test_popup_beval[32]..VerifyScreenDump line 55: See dump file difference: call term_dumpdiff("testdir/failed/Test_popupwin_beval_1.dump", "testdir/dumps/Test_popupwin_beval_1.dump"); difference in line 4: "|4| @73"
	function RunTheTest[40]..Test_popup_beval[35]..VerifyScreenDump line 55: See dump file difference: call term_dumpdiff("testdir/failed/Test_popupwin_beval_2.dump", "testdir/dumps/Test_popupwin_beval_2.dump"); difference in line 4: "|4| @73"
	Flaky test failed too often, giving up
	From test_terminal.vim:
	Found errors in Test_terminal_termwinkey():
	Run 1:
	function RunTheTest[40]..Test_terminal_termwinkey line 22: Expected 1124 but got 1114
	function RunTheTest[40]..Test_terminal_termwinkey line 29: Expected 1124 but got 1114
	function RunTheTest[40]..Test_terminal_termwinkey line 35: Expected 1124 but got 1114
	function RunTheTest[40]..Test_terminal_termwinkey[39]..WaitForAssert[2]..<SNR>7_WaitForCommon[11]..<lambda>142 line 1: Expected 'dead' but got 'run'
	Run 2:
	function RunTheTest[40]..Test_terminal_termwinkey line 22: Expected 1127 but got 1124
	function RunTheTest[40]..Test_terminal_termwinkey line 29: Expected 1127 but got 1124
	function RunTheTest[40]..Test_terminal_termwinkey line 35: Expected 1127 but got 1124
	function RunTheTest[40]..Test_terminal_termwinkey[39]..WaitForAssert[2]..<SNR>7_WaitForCommon[11]..<lambda>143 line 1: Expected 'dead' but got 'run'
	Run 3:
	function RunTheTest[40]..Test_terminal_termwinkey line 22: Expected 1130 but got 1127
	function RunTheTest[40]..Test_terminal_termwinkey line 29: Expected 1130 but got 1127
	function RunTheTest[40]..Test_terminal_termwinkey line 35: Expected 1130 but got 1127
	function RunTheTest[40]..Test_terminal_termwinkey[39]..WaitForAssert[2]..<SNR>7_WaitForCommon[11]..<lambda>144 line 1: Expected 'dead' but got 'run'
	Run 4:
	function RunTheTest[40]..Test_terminal_termwinkey line 22: Expected 1133 but got 1130
	function RunTheTest[40]..Test_terminal_termwinkey line 29: Expected 1133 but got 1130
	function RunTheTest[40]..Test_terminal_termwinkey line 35: Expected 1133 but got 1130
	function RunTheTest[40]..Test_terminal_termwinkey[39]..WaitForAssert[2]..<SNR>7_WaitForCommon[11]..<lambda>145 line 1: Expected 'dead' but got 'run'
	Run 5:
	function RunTheTest[40]..Test_terminal_termwinkey line 22: Expected 1136 but got 1133
	function RunTheTest[40]..Test_terminal_termwinkey line 29: Expected 1136 but got 1133
	function RunTheTest[40]..Test_terminal_termwinkey line 35: Expected 1136 but got 1133
	function RunTheTest[40]..Test_terminal_termwinkey[39]..WaitForAssert[2]..<SNR>7_WaitForCommon[11]..<lambda>146 line 1: Expected 'dead' but got 'run'
	Flaky test failed too often, giving up

TEST FAILURE
Makefile:52: recipe for target 'report' failed
make: *** [report] Error 1

Environment (please complete the following information):

• Vim-8.1.2027 (normal)
• OS: xubuntu-18.04.3
• Terminal: xfce4-terminal-0.8.7.4