Problem:    ColorScheme autocommand triggered when colorscheme is not found.
            (Romain Lafourcade)
Solution:   Only trigger ColorScheme when loading the colorscheme succeeds.
            (closes #11024)

Problem:    Using common name in tests leads to flaky tests.
Solution:   Rename files and directories to be more specific.

Problem:    GUI drop files test sometimes fails.
Solution:   Mark the test as flaky.

Problem:    Win32: cannot test low level events.
Solution:   Add "sendevent" to test_gui_event(). (Yegappan Lakshmanan,
            closes #10679)

Problem:    Still mentioning version8, some cosmetic issues.
Solution:   Prefer mentioning version9, cosmetic improvements.

Problem:    Gui test hangs on MS-Windows.
Solution:   Use "!start" to start Vim.

Problem:    No test for --gui-dialog-file.
Solution:   Add a test.

Problem:    When using XIM the gui test may fail.
Solution:   Only use --not-a-term when not using XIM.

Problem:    MS-Windows GUI: mouse event test sometimes fails.
Solution:   Ignore one move event only if there is an extra event.

Problem:    MS-Windows GUI: mouse event test gets extra event.
Solution:   Ignore one move event.