System File Chooser: Windows: don't allow selecting non-filesystem nodes (e.g. "This PC") in "Select Folder" dialog (issue #1126)

Author: DevCharly

CHANGELOG.md

@@ -9,6 +9,8 @@ FlatLaf Change Log
     shown. (issue #1100)
   - Windows: Fixed too small message dialogs (shown from approve callback).
     (issue #1119)
+  - Windows: Don't allow selecting non-filesystem nodes (e.g. "This PC") in
+    "Select Folder" dialog. (issue #1126)
 - macOS: Fixed missing close/iconify/maximize buttons on inactive window, if
   system appearance is dark, but application appearance is light. (issue #1032)
 - Linux with JetBrains Runtime: Fixed mouse "jumping" to other position when

flatlaf-core/src/main/java/com/formdev/flatlaf/util/SystemFileChooser.java

@@ -996,8 +996,12 @@ String[] showSystemDialog( Window owner, SystemFileChooser fc ) {
 			// options
 			int optionsBlocked = FlatNativeWindowsLibrary.FOS_PICKFOLDERS
 				| FlatNativeWindowsLibrary.FOS_ALLOWMULTISELECT
-				| FlatNativeWindowsLibrary.FOS_FORCESHOWHIDDEN;
-			int optionsSet = fc.getPlatformOptions( WINDOWS_OPTIONS_SET, optionsBlocked );
+				| FlatNativeWindowsLibrary.FOS_FORCESHOWHIDDEN
+				| FlatNativeWindowsLibrary.FOS_FORCEFILESYSTEM
+				| FlatNativeWindowsLibrary.FOS_NOCHANGEDIR;
+			int optionsSet = fc.getPlatformOptions( WINDOWS_OPTIONS_SET, optionsBlocked )
+				| FlatNativeWindowsLibrary.FOS_FORCEFILESYSTEM	// don't allow choosing "This PC" in "Select Folder" dialog
+				| FlatNativeWindowsLibrary.FOS_NOCHANGEDIR;
 			int optionsClear = fc.getPlatformOptions( WINDOWS_OPTIONS_CLEAR, optionsBlocked );
 			if( (optionsClear & FlatNativeWindowsLibrary.FOS_OVERWRITEPROMPT) == 0 )
 				optionsSet |= FlatNativeWindowsLibrary.FOS_OVERWRITEPROMPT;