Revert "Remove unused method"

This reverts commit 751c18fb.

messageviewer/src/utils/mimetype.cpp

@@ -15,6 +15,11 @@
 #include <KIconLoader>
 #include <KMime/Content>
 
+QString MessageViewer::Util::iconPathForMimetype(const QString &mimeType, int iconSize, const QString &fallbackFileName1, const QString &fallbackFileName2)
+{
+    return IconNameCache::instance()->iconPath(MimeTreeParser::Util::iconNameForMimetype(mimeType, fallbackFileName1, fallbackFileName2), iconSize);
+}
+
 QString MessageViewer::Util::iconPathForContent(KMime::Content *node, int size)
 {
     return IconNameCache::instance()->iconPath(MimeTreeParser::Util::iconNameForContent(node), size);

messageviewer/src/utils/mimetype.h

@@ -25,6 +25,28 @@ namespace MessageViewer
  */
 namespace Util
 {
+/**
+ * Finds the filename of an icon based on the given mimetype or filenames.
+ *
+ * Always use this functions when looking up icon names for mime types, don't use
+ * KMimeType directly.
+ *
+ * Uses the IconNameCache internally to speed things up.
+ *
+ * @param mimeType The primary mime type used to find the icon, e.g. "application/zip". Alias
+ *                 mimetypes are resolved.
+ * @param iconSize Size of the requested icon, e.g. KIconLoader::Desktop
+ * @param fallbackFileName1 When the icon is not found by the given mime type, use the file
+ *                              name extensions of these file names to look the icon up.
+ *                              Example: "test.zip"
+ * @param fallbackFileName2 Fallback for @p fallbackFileName1.
+ * @return the full file name of the icon file
+ */
+Q_REQUIRED_RESULT QString MESSAGEVIEWER_EXPORT iconPathForMimetype(const QString &mimeType,
+                                                                   int iconSize,
+                                                                   const QString &fallbackFileName1 = QString(),
+                                                                   const QString &fallbackFileName2 = QString());
+
 Q_REQUIRED_RESULT QString MESSAGEVIEWER_EXPORT iconPathForContent(KMime::Content *node, int iconSize);
 
 struct AttachmentDisplayInfo {