VST3: Add local search path on Windows

We haven't updated the default post-build copy paths yet, as the new
local directory is not yet well-supported by DAWs.

modules/juce_audio_processors/format_types/juce_VST3PluginFormat.cpp

@@ -3746,12 +3746,13 @@ void VST3PluginFormat::recursiveFileSearch (StringArray& results, const File& di
 FileSearchPath VST3PluginFormat::getDefaultLocationsToSearch()
 {
    #if JUCE_WINDOWS
-    auto programFiles = File::getSpecialLocation (File::globalApplicationsDirectory).getFullPathName();
-    return FileSearchPath (programFiles + "\\Common Files\\VST3");
+    const auto localAppData = File::getSpecialLocation (File::windowsLocalAppData)        .getFullPathName();
+    const auto programFiles = File::getSpecialLocation (File::globalApplicationsDirectory).getFullPathName();
+    return FileSearchPath (localAppData + "\\Programs\\Common\\VST3;" + programFiles + "\\Common Files\\VST3");
    #elif JUCE_MAC
-    return FileSearchPath ("/Library/Audio/Plug-Ins/VST3;~/Library/Audio/Plug-Ins/VST3");
+    return FileSearchPath ("~/Library/Audio/Plug-Ins/VST3;/Library/Audio/Plug-Ins/VST3");
    #else
-    return FileSearchPath ("/usr/lib/vst3/;/usr/local/lib/vst3/;~/.vst3/");
+    return FileSearchPath ("~/.vst3/;/usr/lib/vst3/;/usr/local/lib/vst3/");
    #endif
 }
 

modules/juce_core/files/juce_File.h

@@ -942,7 +942,10 @@ public:
 
             @see globalApplicationsDirectory
         */
-        globalApplicationsDirectoryX86
+        globalApplicationsDirectoryX86,
+
+        /** On a Windows machine returns the %LOCALAPPDATA% folder. */
+        windowsLocalAppData
        #endif
     };
 

modules/juce_core/native/juce_win32_Files.cpp

@@ -618,17 +618,18 @@ File JUCE_CALLTYPE File::getSpecialLocation (const SpecialLocationType type)
 
     switch (type)
     {
-        case userHomeDirectory:                 csidlType = CSIDL_PROFILE; break;
-        case userDocumentsDirectory:            csidlType = CSIDL_PERSONAL; break;
-        case userDesktopDirectory:              csidlType = CSIDL_DESKTOP; break;
-        case userApplicationDataDirectory:      csidlType = CSIDL_APPDATA; break;
-        case commonApplicationDataDirectory:    csidlType = CSIDL_COMMON_APPDATA; break;
-        case commonDocumentsDirectory:          csidlType = CSIDL_COMMON_DOCUMENTS; break;
-        case globalApplicationsDirectory:       csidlType = CSIDL_PROGRAM_FILES; break;
-        case globalApplicationsDirectoryX86:    csidlType = CSIDL_PROGRAM_FILESX86; break;
-        case userMusicDirectory:                csidlType = 0x0d; /*CSIDL_MYMUSIC*/ break;
-        case userMoviesDirectory:               csidlType = 0x0e; /*CSIDL_MYVIDEO*/ break;
-        case userPicturesDirectory:             csidlType = 0x27; /*CSIDL_MYPICTURES*/ break;
+        case userHomeDirectory:                 csidlType = CSIDL_PROFILE;              break;
+        case userDocumentsDirectory:            csidlType = CSIDL_PERSONAL;             break;
+        case userDesktopDirectory:              csidlType = CSIDL_DESKTOP;              break;
+        case userApplicationDataDirectory:      csidlType = CSIDL_APPDATA;              break;
+        case commonApplicationDataDirectory:    csidlType = CSIDL_COMMON_APPDATA;       break;
+        case commonDocumentsDirectory:          csidlType = CSIDL_COMMON_DOCUMENTS;     break;
+        case globalApplicationsDirectory:       csidlType = CSIDL_PROGRAM_FILES;        break;
+        case globalApplicationsDirectoryX86:    csidlType = CSIDL_PROGRAM_FILESX86;     break;
+        case windowsLocalAppData:               csidlType = CSIDL_LOCAL_APPDATA;        break;
+        case userMusicDirectory:                csidlType = 0x0d; /*CSIDL_MYMUSIC*/     break;
+        case userMoviesDirectory:               csidlType = 0x0e; /*CSIDL_MYVIDEO*/     break;
+        case userPicturesDirectory:             csidlType = 0x27; /*CSIDL_MYPICTURES*/  break;
 
         case tempDirectory:
         {