[Regression, minor] Visual defect in MacVim preferences

[eirnym]

Describe the bug
MacVim preferences tab transition makes labels overlap over themselves for a second

To Reproduce
Detailed steps to reproduce the behavior:

1. Run vim --clean (doesn't really matter)
2. Open preferences (Cmd-,)
3. Switch tabs

you have at least a second to look at this mess

Expected behavior
Transition is fast and smooth, like Safari or Mail, or System Settings (as it was before)

Screenshots

Environment (please complete the following information):

• MacVim 163 from GitHub
• macOS 10.15.4 (19E287)

Additional context
defaults:

$ defaults read org.vim.MacVim | grep 'MM\|SU'
    MMAutosaveColumns = 150;
    MMAutosaveRows = 59;
    MMCurrentPreferencePane = General;
    MMRenderer = 1;
    MMTitlebarAppearsTransparent = 1;
    MMTopLeftPoint = "{1025, 1010}";
    "NSWindow Frame SUUpdateAlert" = "530 487 620 392 0 0 1680 1027 ";
    SUCheckAtStartup = 1;
    SUEnableAutomaticChecks = 1;
    SUHasLaunchedBefore = 1;
    SULastCheckTime = "2020-04-13 08:12:05 +0000";
    SUSendProfileInfo = 0;
    SUUpdateGroupIdentifier = 4120494361;
    SUUpdateRelaunchingMarker = 0;

[ychin]

I'm confused. What has regressed? This is how preference panel in MacVim has worked for years. It's a minor issue for sure, but I'm not sure why it was tagged as "regression".

The PR you are looking at (#1038) in fact turns off that cross-fade anyway so it will go away next release.

[ychin]

Anyway, closing this issue because either way it should be fixed in the latest change that will be released in 164.

[eirnym]

I haven't seen this ever in MacVim, but thanks