propose filename when exporting sales as json

.clang-format

@@ -1,4 +1,3 @@
----
 Language:        Cpp
 # BasedOnStyle:  LLVM
 AccessModifierOffset: -2
@@ -90,10 +89,6 @@ PenaltyBreakString: 1000
 PenaltyExcessCharacter: 1000000
 PenaltyReturnTypeOnItsOwnLine: 60
 PointerAlignment: Left
-RawStringFormats: 
-  - Delimiter:       pb
-    Language:        TextProto
-    BasedOnStyle:    google
 ReflowComments:  true
 SortIncludes:    true
 SortUsingDeclarations: true
@@ -108,8 +103,7 @@ SpacesInContainerLiterals: true
 SpacesInCStyleCastParentheses: false
 SpacesInParentheses: false
 SpacesInSquareBrackets: false
-Standard:        Cpp11
+Standard:        Auto
 TabWidth:        8
 UseTab:          Never
-...
 

src/gui/mainwindow.cpp

@@ -163,7 +163,6 @@ void MainWindow::onActionEditSellerTriggered()
 
     setSaleModel();
     updateStatLabel();
-
 }
 
 void MainWindow::setSaleModel()
@@ -195,7 +194,6 @@ void MainWindow::onPaidButtonTriggered()
         ui_.sellerNoEdit->setFocus();
         statusBar()->showMessage("Verkaufsvorgang erfolgreich durchgeführt.", STATUSBAR_TIMEOUT);
         updateStatLabel();
-
     }
 }
 
@@ -445,7 +443,6 @@ void MainWindow::onImportSellerExcelActionTriggered()
 
     ExcelReader::readSellersFromFile(filePath, marketplace_.get());
     updateStatLabel();
-
 }
 
 void MainWindow::onImportSellerJsonActionTriggered()
@@ -468,7 +465,6 @@ void MainWindow::onImportSellerJsonActionTriggered()
 
     JsonUtil::importSellers(filePath, marketplace_.get());
     updateStatLabel();
-
 }
 
 void MainWindow::onExportSellerJsonActionTriggered()
@@ -488,8 +484,10 @@ void MainWindow::onExportSalesJsonActionTriggered()
 {
     QSettings settings;
 
-    auto filename = QFileDialog::getSaveFileName(this, "Umsätze/Transaktionen exportieren",
+    auto filename = QFileDialog::getSaveFileName(
-                                                 QString(), "JSON Dateien (*.json)");
+        this, "Umsätze/Transaktionen exportieren",
+        QString("kima2_umsaetze_kasse") + settings.value("global/cashPointNo").toString() + ".json",
+        "JSON Dateien (*.json)");
 
     if (filename.isEmpty())
         return;
@@ -523,7 +521,6 @@ void MainWindow::onImportSalesJsonActionTriggered()
     }
     setSaleModel();
     updateStatLabel();
-
 }
 
 void MainWindow::writeGeometry()