dont cache default background image, cmd+m minimizes window in os x

Telegram/SourceFiles/app.cpp

@@ -1808,16 +1808,22 @@ namespace App {
 		if (Local::readBackground()) return;
 
 		QImage img(p);
+		bool remove = false;
 		if (p.isNull()) {
 			img.load(st::msgBG);
 			id = 0;
+			remove = true;
 		}
 		if (img.format() != QImage::Format_ARGB32 && img.format() != QImage::Format_ARGB32_Premultiplied && img.format() != QImage::Format_RGB32) {
 			img = img.convertToFormat(QImage::Format_RGB32);
 		}
 		img.setDevicePixelRatio(cRetinaFactor());
 
-		if (!nowrite) Local::writeBackground(id, img);
+		if (remove) {
+			Local::writeBackground(0, QImage());
+		} else if (!nowrite) {
+			Local::writeBackground(id, img);
+		}
 
 		delete cChatBackground();
 		cSetChatBackground(new QPixmap(QPixmap::fromImage(img, Qt::ColorOnly)));

Telegram/SourceFiles/application.cpp

@@ -60,6 +60,9 @@ namespace {
 						App::wnd()->minimizeToTray();
 						return true;
 					}
+				} else if (ev->key() == Qt::Key_M && (ev->modifiers() & (Qt::MetaModifier | Qt::ControlModifier))) {
+					App::wnd()->setWindowState(Qt::WindowMinimized);
+					return true;
 				}
 			}
 			return QObject::eventFilter(o, e);

Telegram/SourceFiles/boxes/backgroundbox.cpp

@@ -78,7 +78,7 @@ void BackgroundInner::gotWallpapers(const MTPVector<MTPWallPaper> &result) {
 				}
 			}
 			if (thumb && full && full->type() != mtpc_photoSizeEmpty) {
-				wallpapers.push_back(App::WallPaper(d.vid.v, App::image(*thumb), App::image(*full)));
+				wallpapers.push_back(App::WallPaper(d.vid.v ? d.vid.v : INT_MAX, App::image(*thumb), App::image(*full)));
 			}
 		} break;
 

Telegram/SourceFiles/localstorage.cpp

@@ -2178,6 +2178,15 @@ namespace Local {
 	void writeBackground(int32 id, const QImage &img) {
 		if (!_working()) return;
 
+		if (img.isNull()) {
+			if (_backgroundKey) {
+				clearKey(_backgroundKey);
+				_backgroundKey = 0;
+				_mapChanged = true;
+			}
+			_writeMap();
+			return;
+		}
 		QByteArray png;
 		{
 			QBuffer buf(&png);

Telegram/SourceFiles/mainwidget.cpp

@@ -1591,7 +1591,7 @@ void MainWidget::checkChatBackground() {
 			if (_background->full->isNull()) {
 				App::initBackground();
 			} else {
-				App::initBackground(_background->id, _background->full->pix().toImage());
+				App::initBackground(_background->id, _background->id ? _background->full->pix().toImage() : QImage());
 			}
 			delete _background;
 			_background = 0;