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install.ps1: prime shell image list for new shortcuts (blank-icon race fix)

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Diagnosis this cycle: the .ico is well-formed (6 BMP frames 16-256px) and the
shell resolves the logo at every size (verified via SHGetFileInfo +
SHGetImageList/ImageList_GetIcon on the system image list, all sizes incl. the
256px jumbo slot the desktop draws). The residual blank is a first-paint race:
Explorer lazily extracts a .lnk's icon and a miss (icon not yet flushed, cache
just cleared) gets cached blank. Force the extraction at install time via
SHGetFileInfo(SHGFI_SYSICONINDEX) per .lnk, populating the per-session image
list both Desktop and Start Menu draw from. WoA path only, try/catch-wrapped.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Daniel Han 2026-06-04 14:13:43 -07:00
commit 4ee9aa5ab5
1 changed files with 11 additions and 0 deletions
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install.ps1
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@ -1698,6 +1698,17 @@ shell.Run cmd, 0, False
# (item args unused for this event).
[UnslothShell.Notify]::SHChangeNotify(0x08000000, 0, $null, [System.IntPtr]::Zero)
} catch {}
# Prime the shell system image list NOW so Desktop + Start Menu extract the real
# icon immediately. A lazy first-paint extraction that misses (icon not yet flushed,
# cache just cleared) is what gets cached as a blank; SHGFI_SYSICONINDEX forces the
# extraction here, while the .ico is known-present. (WoA path only; both views draw
# from this one per-session list.)
try {
if (-not ("UnslothShell.IconPrime" -as [type])) {
Add-Type -TypeDefinition 'using System; using System.Runtime.InteropServices; namespace UnslothShell { public class IconPrime { [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Unicode)] struct FI { public IntPtr h; public int i; public uint a; [MarshalAs(UnmanagedType.ByValTStr, SizeConst=260)] public string n; [MarshalAs(UnmanagedType.ByValTStr, SizeConst=80)] public string t; } [DllImport("shell32.dll", CharSet=CharSet.Unicode)] static extern IntPtr SHGetFileInfo(string p, uint a, ref FI i, uint cb, uint f); public static void Prime(string path){ FI fi=new FI(); SHGetFileInfo(path,0,ref fi,(uint)Marshal.SizeOf(fi),0x4000); } } }'
}
foreach ($lnk in $lnks) { try { [UnslothShell.IconPrime]::Prime($lnk) } catch {} }
} catch {}
} catch {
substep "(could not create shortcuts: $($_.Exception.Message))" "Yellow"
}