From 7b38b5e369f45132cc83732cc5852538ad6075e8 Mon Sep 17 00:00:00 2001
From: Mike Chen <chenke@deepin.org>
Date: Mon, 15 Jan 2024 21:03:55 +0800
Subject: [PATCH] Make sure hicolor is searched before dash fallbacks

Search full icon name from hicolor before dash fallback

Pick-to: 6.6
Fixes: QTBUG-121030
Change-Id: I3e3ee142c33466203639f32857fce3ea1946a9f7
Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>
(cherry picked from commit 0534a93ef04f38cf6dfc0d6c03827325d651a64c)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
---
 src/gui/image/qiconloader.cpp | 35 ++++++++++++++++++++---------------
 src/gui/image/qiconloader_p.h |  5 ++++-
 2 files changed, 24 insertions(+), 16 deletions(-)

diff --git a/src/gui/image/qiconloader.cpp b/src/gui/image/qiconloader.cpp
index e02fa73ba83..982b9a26b49 100644
--- a/src/gui/image/qiconloader.cpp
+++ b/src/gui/image/qiconloader.cpp
@@ -441,7 +441,8 @@ QDebug operator<<(QDebug debug, const std::unique_ptr<QIconLoaderEngineEntry> &e
 
 QThemeIconInfo QIconLoader::findIconHelper(const QString &themeName,
                                            const QString &iconName,
-                                           QStringList &visited) const
+                                           QStringList &visited,
+                                           DashRule rule) const
 {
     qCDebug(lcIconLoader) << "Finding icon" << iconName << "in theme" << themeName
                           << "skipping" << visited;
@@ -464,10 +465,10 @@ QThemeIconInfo QIconLoader::findIconHelper(const QString &themeName,
     const QStringList contentDirs = theme.contentDirs();
 
     QStringView iconNameFallback(iconName);
-    bool searchingGenericFallback = false;
+    bool searchingGenericFallback = m_iconName.length() > iconName.length();
 
     // Iterate through all icon's fallbacks in current theme
-    while (info.entries.empty()) {
+    if (info.entries.empty()) {
         const QString svgIconName = iconNameFallback + ".svg"_L1;
         const QString pngIconName = iconNameFallback + ".png"_L1;
 
@@ -527,16 +528,7 @@ QThemeIconInfo QIconLoader::findIconHelper(const QString &themeName,
 
         if (!info.entries.empty()) {
             info.iconName = iconNameFallback.toString();
-            break;
         }
-
-        // If it's possible - find next fallback for the icon
-        const int indexOfDash = iconNameFallback.lastIndexOf(u'-');
-        if (indexOfDash == -1)
-            break;
-
-        iconNameFallback.truncate(indexOfDash);
-        searchingGenericFallback = true;
     }
 
     if (info.entries.empty()) {
@@ -551,13 +543,25 @@ QThemeIconInfo QIconLoader::findIconHelper(const QString &themeName,
             const QString parentTheme = parents.at(i).trimmed();
 
             if (!visited.contains(parentTheme)) // guard against recursion
-                info = findIconHelper(parentTheme, iconName, visited);
+                info = findIconHelper(parentTheme, iconName, visited, QIconLoader::NoFallBack);
 
             if (!info.entries.empty()) // success
                 break;
         }
     }
 
+    if (rule == QIconLoader::FallBack && info.entries.empty()) {
+        // If it's possible - find next fallback for the icon
+        const int indexOfDash = iconNameFallback.lastIndexOf(u'-');
+        if (indexOfDash != -1) {
+            qCDebug(lcIconLoader) << "Did not find matching icons in all themes;"
+                                  << "trying dash fallback";
+            iconNameFallback.truncate(indexOfDash);
+            QStringList _visited;
+            info = findIconHelper(themeName, iconNameFallback.toString(), _visited, QIconLoader::FallBack);
+        }
+    }
+
     return info;
 }
 
@@ -605,13 +609,14 @@ QThemeIconInfo QIconLoader::loadIcon(const QString &name) const
 {
     qCDebug(lcIconLoader) << "Loading icon" << name;
 
+    m_iconName = name;
     QThemeIconInfo iconInfo;
     QStringList visitedThemes;
     if (!themeName().isEmpty())
-        iconInfo = findIconHelper(themeName(), name, visitedThemes);
+        iconInfo = findIconHelper(themeName(), name, visitedThemes, QIconLoader::FallBack);
 
     if (iconInfo.entries.empty() && !fallbackThemeName().isEmpty())
-        iconInfo = findIconHelper(fallbackThemeName(), name, visitedThemes);
+        iconInfo = findIconHelper(fallbackThemeName(), name, visitedThemes, QIconLoader::FallBack);
 
     if (iconInfo.entries.empty())
         iconInfo = lookupFallbackIcon(name);
diff --git a/src/gui/image/qiconloader_p.h b/src/gui/image/qiconloader_p.h
index cf42e28a481..3cfa9381d1a 100644
--- a/src/gui/image/qiconloader_p.h
+++ b/src/gui/image/qiconloader_p.h
@@ -187,9 +187,11 @@ public:
     QIconEngine *iconEngine(const QString &iconName) const;
 
 private:
+    enum DashRule { FallBack, NoFallBack };
     QThemeIconInfo findIconHelper(const QString &themeName,
                                   const QString &iconName,
-                                  QStringList &visited) const;
+                                  QStringList &visited,
+                                  DashRule rule) const;
     QThemeIconInfo lookupFallbackIcon(const QString &iconName) const;
 
     uint m_themeKey;
@@ -202,6 +204,7 @@ private:
     mutable QStringList m_iconDirs;
     mutable QHash <QString, QIconTheme> themeList;
     mutable QStringList m_fallbackDirs;
+    mutable QString m_iconName;
 };
 
 QT_END_NAMESPACE