FormSettings: InvalidOperationException IGitUICommands

[mstv]

In the current master, whenever I open the settings window, I get an exception here:

gitextensions/GitUI/CommandsDialogs/SettingsDialog/Pages/ScriptsSettingsPage.cs

Line 124 in a0d8a30

throw new InvalidOperationException("IGitUICommands should have been assigned");

I can push the rebased version anyway, but I feel iffy about pushing a version that I can only test partially.

Originally posted by @SlugFiller in #11239 (comment)

[mstv]

FindForm() returns null because SettingsPageHeader.Parent is null at

>	ResourceManager.dll!ResourceManager.GitExtensionsControl.TryGetUICommands(out GitUIPluginInterfaces.IGitUICommands commands) Line 74	C#
 	GitUI.dll!GitUI.CommandsDialogs.SettingsDialog.Pages.ScriptsSettingsPage.ScriptsManager.get() Line 122	C#
 	GitUI.dll!GitUI.CommandsDialogs.SettingsDialog.Pages.ScriptsSettingsPage.SettingsToPage() Line 177	C#
 	GitUI.dll!GitUI.CommandsDialogs.SettingsDialog.SettingsPageBase.LoadSettings() Line 100	C#
 	GitUI.dll!GitUI.CommandsDialogs.FormSettings.LoadSettings() Line 68	C#
 	GitUI.dll!GitUI.CommandsDialogs.FormSettings.FormSettings_Shown(object sender, System.EventArgs e) Line 272	C#
 	[External Code]	
 	ResourceManager.dll!ResourceManager.GitExtensionsFormBase.WndProc(ref System.Windows.Forms.Message m) Line 106	C#
 	[External Code]	
 	GitUI.dll!GitUI.CommandsDialogs.FormSettings.ShowSettingsDialog.AnonymousMethod__0() Line 95	C#
 	GitCommands.dll!GitCommands.AppSettings.UsingContainer.AnonymousMethod__0() Line 191	C#
 	GitCommands.dll!GitCommands.Settings.SettingsContainer<GitCommands.Settings.DistributedSettings, GitCommands.Settings.GitExtSettingsCache>.LockedAction.AnonymousMethod__0() Line 29	C#
 	GitCommands.dll!GitCommands.SettingsCache.LockedAction.AnonymousMethod__0() Line 26	C#
 	GitCommands.dll!GitCommands.SettingsCache.LockedAction<object>(System.Func<object> action) Line 35	C#
 	GitCommands.dll!GitCommands.SettingsCache.LockedAction(System.Action action) Line 24	C#
 	GitCommands.dll!GitCommands.Settings.SettingsContainer<GitCommands.Settings.DistributedSettings, GitCommands.Settings.GitExtSettingsCache>.LockedAction(System.Action action) Line 21	C#
 	GitCommands.dll!GitCommands.AppSettings.UsingContainer(GitCommands.Settings.DistributedSettings settingsContainer, System.Action action) Line 185	C#
 	GitUI.dll!GitUI.CommandsDialogs.FormSettings.ShowSettingsDialog(GitUI.GitUICommands uiCommands, System.Windows.Forms.IWin32Window owner, GitUI.CommandsDialogs.SettingsDialog.SettingsPageReference initialPage) Line 93	C#
 	GitUI.dll!GitUI.GitUICommands.StartSettingsDialog.__Action|0() Line 915	C#
 	GitUI.dll!GitUI.GitUICommands.DoActionOnRepo(System.Windows.Forms.IWin32Window owner, System.Func<bool> action, bool requiresValidWorkingDir, bool changesRepo, System.EventHandler<GitUIPluginInterfaces.GitUIEventArgs> preEvent, System.EventHandler<GitUIPluginInterfaces.GitUIPostActionEventArgs> postEvent) Line 322	C#
 	GitUI.dll!GitUI.GitUICommands.StartSettingsDialog(System.Windows.Forms.IWin32Window owner, GitUI.CommandsDialogs.SettingsDialog.SettingsPageReference initialPage) Line 919	C#
 	GitUI.dll!GitUI.CommandsDialogs.FormBrowse.OnShowSettingsClick(object sender, System.EventArgs e) Line 1485	C#
 	[External Code]	
 	GitUI.dll!GitUI.CommandsDialogs.FormBrowse.ExecuteCommand(int cmd) Line 2132	C#
 	ResourceManager.dll!ResourceManager.GitExtensionsFormBase.ProcessHotkey(System.Windows.Forms.Keys keyData) Line 52	C#
 	GitUI.dll!GitUI.CommandsDialogs.FormBrowse.ProcessHotkey(System.Windows.Forms.Keys keyData) Line 2078	C#
 	ResourceManager.dll!ResourceManager.GitExtensionsFormBase.ProcessCmdKey(ref System.Windows.Forms.Message msg, System.Windows.Forms.Keys keyData) Line 68	C#
 	[External Code]	
 	ResourceManager.dll!ResourceManager.GitExtensionsControl.ProcessCmdKey(ref System.Windows.Forms.Message msg, System.Windows.Forms.Keys keyData) Line 112	C#
 	[External Code]	
 	GitUI.dll!GitUI.GitUICommands.StartBrowseDialog(System.Windows.Forms.IWin32Window owner, GitUI.CommandsDialogs.FormBrowse.BrowseArguments args) Line 1135	C#
 	GitUI.dll!GitUI.GitUICommands.RunBrowseCommand(System.Collections.Generic.IReadOnlyList<string> args) Line 1583	C#
 	GitUI.dll!GitUI.GitUICommands.RunCommandBasedOnArgument(System.Collections.Generic.IReadOnlyList<string> args, System.Collections.Generic.IReadOnlyDictionary<string, string> arguments) Line 1428	C#
 	GitUI.dll!GitUI.GitUICommands.RunCommand(System.Collections.Generic.IReadOnlyList<string> args) Line 1401	C#
 	GitExtensions.dll!GitExtensions.Program.RunApplication() Line 212	C#
 	GitExtensions.dll!GitExtensions.Program.Main() Line 115	C#