Linux: Add warnAboutOverwriting flag capability to native file chooser

modules/juce_gui_basics/native/juce_linux_FileChooser.cpp

@@ -46,7 +46,8 @@ public:
         : owner (fileChooser),
           isDirectory         ((flags & FileBrowserComponent::canSelectDirectories)   != 0),
           isSave              ((flags & FileBrowserComponent::saveMode)               != 0),
-          selectMultipleFiles ((flags & FileBrowserComponent::canSelectMultipleItems) != 0)
+          selectMultipleFiles ((flags & FileBrowserComponent::canSelectMultipleItems) != 0),
+          warnAboutOverwrite  ((flags & FileBrowserComponent::warnAboutOverwriting)   != 0)
     {
         const File previousWorkingDirectory (File::getCurrentWorkingDirectory());
 
@@ -81,7 +82,7 @@ public:
 
 private:
     FileChooser& owner;
-    bool isDirectory, isSave, selectMultipleFiles;
+    bool isDirectory, isSave, selectMultipleFiles, warnAboutOverwrite;
 
     ChildProcess child;
     StringArray args;
@@ -194,6 +195,9 @@ private:
         args.add ("zenity");
         args.add ("--file-selection");
 
+        if (warnAboutOverwrite)
+            args.add("--confirm-overwrite");
+
         if (owner.title.isNotEmpty())
             args.add ("--title=" + owner.title);