restore '+' in string

Tests/Unit/GUI/TestScientificSpinBox.cpp

@@ -53,7 +53,7 @@ TEST(TestScientificSpinBox, testTextFromValue)
     int decimals = 3;
     auto to_string = [&decimals](double val) { return ScientificSpinBox::toString(val, decimals); };
 
-    EXPECT_EQ("-1.235e2", to_string(-123.45).toStdString());
+    EXPECT_EQ("-1.235e+2", to_string(-123.45).toStdString());
     EXPECT_EQ("-100", to_string(-99.9999).toStdString());
     EXPECT_EQ("-99.999", to_string(-99.9994).toStdString());
     EXPECT_EQ("-10.123", to_string(-10.12345).toStdString());
@@ -79,10 +79,10 @@ TEST(TestScientificSpinBox, testTextFromValue)
     EXPECT_EQ("99.9", to_string(99.9).toStdString());
     EXPECT_EQ("99.999", to_string(99.9994).toStdString());
     EXPECT_EQ("100", to_string(99.9999).toStdString());
-    EXPECT_EQ("1.235e2", to_string(123.45).toStdString());
-    EXPECT_EQ("1e4", to_string(1e4).toStdString());
-    EXPECT_EQ("1.265e12", to_string(1.265e12).toStdString());
-    EXPECT_EQ("1.266e12", to_string(1.26555e12).toStdString());
+    EXPECT_EQ("1.235e+2", to_string(123.45).toStdString());
+    EXPECT_EQ("1e+4", to_string(1e4).toStdString());
+    EXPECT_EQ("1.265e+12", to_string(1.265e12).toStdString());
+    EXPECT_EQ("1.266e+12", to_string(1.26555e12).toStdString());
 
     decimals = 5;
     EXPECT_EQ("1.23e-12", to_string(1.23e-12).toStdString());
@@ -92,8 +92,8 @@ TEST(TestScientificSpinBox, testTextFromValue)
     EXPECT_EQ("10.12346", to_string(10.123456).toStdString());
     EXPECT_EQ("99.9", to_string(99.9).toStdString());
     EXPECT_EQ("100", to_string(99.999999).toStdString());
-    EXPECT_EQ("1.2345e2", to_string(123.45).toStdString());
-    EXPECT_EQ("1.26556e12", to_string(1.265556e12).toStdString());
+    EXPECT_EQ("1.2345e+2", to_string(123.45).toStdString());
+    EXPECT_EQ("1.26556e+12", to_string(1.265556e12).toStdString());
 }
 
 TEST(TestScientificSpinBox, testRound)