gwen: Bundle pdfium runtime in Windows installer

crates/zed/resources/windows/gwen.iss

@@ -66,6 +66,7 @@ Name: "{app}"; AfterInstall: DisableAppDirInheritance
 
 [Files]
 Source: "{#ResourcesDir}\Gwen.exe"; DestDir: "{code:GetInstallDir}"; Flags: ignoreversion
+Source: "{#ResourcesDir}\pdfium.dll"; DestDir: "{code:GetInstallDir}"; Flags: ignoreversion
 Source: "{#ResourcesDir}\bin\*"; DestDir: "{code:GetInstallDir}\bin"; Flags: ignoreversion
 Source: "{#ResourcesDir}\tools\*"; DestDir: "{app}\tools"; Flags: ignoreversion
 Source: "{#ResourcesDir}\appx\*"; DestDir: "{app}\appx";  BeforeInstall: RemoveAppxPackage; AfterInstall: AddAppxPackage; Flags: ignoreversion; Check: IsWindows11OrLater

script/bundle-windows.ps1

@@ -41,7 +41,7 @@ function Get-VSArch {
 }
 
 Push-Location
-& "C:\Program Files\Microsoft Visual Studio\2022\Community\Common7\Tools\Launch-VsDevShell.ps1" -Arch (Get-VSArch -Arch $Architecture) -HostArch (Get-VSArch -Arch $OSArchitecture)
+& "C:\Program Files\Microsoft Visual Studio\18\Community\Common7\Tools\Launch-VsDevShell.ps1" -Arch (Get-VSArch -Arch $Architecture) -HostArch (Get-VSArch -Arch $OSArchitecture)
 Pop-Location
 
 $target = "$Architecture-pc-windows-msvc"
@@ -156,7 +156,7 @@ function BuildRemoteServer {
 
 function ZipZedAndItsFriendsDebug {
     $items = @(
-        ".\$CargoOutDir\zed.pdb",
+        ".\$CargoOutDir\gwen.pdb",
         ".\$CargoOutDir\cli.pdb",
         ".\$CargoOutDir\auto_update_helper.pdb",
         ".\$CargoOutDir\explorer_command_injector.pdb",
@@ -239,12 +239,28 @@ function DownloadConpty {
     Expand-Archive -Path $zipPath -DestinationPath ".\conpty" -Force
 }
 
+function DownloadPdfium {
+    # Runtime library for the bundled pdf_viewer (dlopen'd as pdfium.dll).
+    $url = "https://github.com/bblanchon/pdfium-binaries/releases/download/chromium/8066/pdfium-win-x64.tgz"
+    $tgzPath = ".\pdfium-win-x64.tgz"
+    $sha256 = "739A57D597D864297909CC40A2411EBA728490C76A0FA25E3EA299C7F6B07020"
+    if (-not (Test-Path $tgzPath) -or (Get-FileHash $tgzPath -Algorithm SHA256).Hash -ne $sha256) {
+        Invoke-WebRequest -Uri $url -OutFile $tgzPath
+    }
+    if ((Get-FileHash $tgzPath -Algorithm SHA256).Hash -ne $sha256) {
+        throw "pdfium-win-x64.tgz checksum mismatch"
+    }
+    New-Item -Path ".\pdfium" -ItemType Directory -Force
+    tar -xzf $tgzPath -C ".\pdfium" "bin/pdfium.dll"
+}
+
 function CollectFiles {
     Move-Item -Path "$innoDir\zed_explorer_command_injector.appx" -Destination "$innoDir\appx\zed_explorer_command_injector.appx" -Force
     Move-Item -Path "$innoDir\zed_explorer_command_injector.dll" -Destination "$innoDir\appx\zed_explorer_command_injector.dll" -Force
     Move-Item -Path "$innoDir\cli.exe" -Destination "$innoDir\bin\gwen.exe" -Force
     Move-Item -Path "$innoDir\gwen.sh" -Destination "$innoDir\bin\gwen" -Force
     Move-Item -Path "$innoDir\auto_update_helper.exe" -Destination "$innoDir\tools\auto_update_helper.exe" -Force
+    Move-Item -Path ".\pdfium\bin\pdfium.dll" -Destination "$innoDir\pdfium.dll" -Force
     if($Architecture -eq "aarch64") {
         New-Item -Type Directory -Path "$innoDir\arm64" -Force
         Move-Item -Path ".\conpty\build\native\runtimes\arm64\OpenConsole.exe" -Destination "$innoDir\arm64\OpenConsole.exe" -Force
@@ -383,7 +399,9 @@ $debugStoreKey = "$env:ZED_RELEASE_CHANNEL/zed-$env:RELEASE_VERSION-$env:ZED_REL
 
 CheckEnvironmentVariables
 PrepareForBundle
+if (-not (Test-Path "assets/licenses.md")) {
     GenerateLicenses
+}
 BuildZedAndItsFriends
 BuildRemoteServer
 MakeAppx
@@ -391,6 +409,7 @@ SignZedAndItsFriends
 ZipZedAndItsFriendsDebug
 DownloadAMDGpuServices
 DownloadConpty
+DownloadPdfium
 CollectFiles
 BuildInstaller