Clear unused emoji cache with DB.

Telegram/SourceFiles/boxes/local_storage_box.cpp

@@ -15,6 +15,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "ui/widgets/shadow.h"
 #include "ui/widgets/continuous_sliders.h"
 #include "ui/effects/radial_animation.h"
+#include "ui/emoji_config.h"
 #include "storage/localstorage.h"
 #include "storage/cache/storage_cache_database.h"
 #include "data/data_session.h"
@@ -316,6 +317,7 @@ void LocalStorageBox::clearByTag(uint8 tag) {
 		_db->clearByTag(tag);
 	} else {
 		_db->clear();
+		Ui::Emoji::ClearIrrelevantCache();
 	}
 }
 

Telegram/SourceFiles/ui/emoji_config.cpp

@@ -65,11 +65,14 @@ QString CacheFileFolder() {
 	return cWorkingDir() + "tdata/emoji";
 }
 
+QString CacheFileNameMask(int size) {
+	return "cache_" + QString::number(size) + '_';
+}
+
 QString CacheFilePath(int size, int index) {
 	return CacheFileFolder()
-		+ "/cache_"
-		+ QString::number(size)
-		+ '_'
+		+ '/'
+		+ CacheFileNameMask(size)
 		+ QString::number(index);
 }
 
@@ -323,6 +326,23 @@ void Clear() {
 	InstanceLarge = nullptr;
 }
 
+void ClearIrrelevantCache() {
+	Expects(SizeNormal > 0);
+	Expects(SizeLarge > 0);
+
+	crl::async([] {
+		const auto folder = CacheFileFolder();
+		const auto list = QDir(folder).entryList(QDir::Files);
+		const auto good1 = CacheFileNameMask(SizeNormal);
+		const auto good2 = CacheFileNameMask(SizeLarge);
+		for (const auto &name : list) {
+			if (!name.startsWith(good1) && !name.startsWith(good2)) {
+				QFile(folder + '/' + name).remove();
+			}
+		}
+	});
+}
+
 int GetSizeNormal() {
 	Expects(SizeNormal > 0);
 

Telegram/SourceFiles/ui/emoji_config.h

@@ -18,6 +18,8 @@ constexpr auto kRecentLimit = 42;
 void Init();
 void Clear();
 
+void ClearIrrelevantCache();
+
 int GetSizeNormal();
 int GetSizeLarge();