KDirectoryContentsCounter: show intermediate dir size counting results, improve stopping, improve data caching

Two user visible changes:
 * we can see the dir size changing as it is updated.
 * This makes the file counting a lot more reactive, when changing directories for instance.

`KDirectoryContentsCounterWorker::walkDir` is not recursive anymore.

The cache is now shared and only a single thread is used to count size recursively.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/kitemviews/kfileitemlistwidget.cpp b/src/kitemviews/kfileitemlistwidget.cpp
index d9644bef5..ec8683345 100644
--- a/src/kitemviews/kfileitemlistwidget.cpp
+++ b/src/kitemviews/kfileitemlistwidget.cpp
@@ -67,7 +67,7 @@ QString KFileItemListWidgetInformant::roleText(const QByteArray &role, const QHa
         if (values.value("isDir").toBool()) {
             if (!roleValue.isNull() && roleValue != -1) {
                 // The item represents a directory.
-                if (DetailsModeSettings::directorySizeCount()) {
+                if (DetailsModeSettings::directorySizeCount() || roleValue == -2 /* size is invalid */) {
                     //  Show the number of sub directories instead of the file size of the directory.
                     const int count = values.value("count").toInt();
                     text = i18ncp("@item:intable", "%1 item", "%1 items", count);