Fix broken pattern conversion.

src/libs/ifc/xml/vpatternconverter.cpp

@@ -359,6 +359,8 @@ void VPatternConverter::ApplyPatches()
         case (FormatVersion(0, 8, 6)):
         case (FormatVersion(0, 8, 7)):
         case (FormatVersion(0, 8, 8)):
+            ToV0_8_8();
+            Q_FALLTHROUGH();
         case (FormatVersion(0, 8, 9)):
         case (FormatVersion(0, 8, 10)):
         case (FormatVersion(0, 8, 11)):
@@ -519,6 +521,18 @@ void VPatternConverter::ToV0_6_2()
     Save();
 }
 
+//---------------------------------------------------------------------------------------------------------------------
+void VPatternConverter::ToV0_8_8()
+{
+    // TODO. Delete if minimal supported version is 0.8.8
+    Q_STATIC_ASSERT_X(VPatternConverter::PatternMinVer < FormatVersion(0, 8, 8),
+                      "Time to refactor the code.");
+    SetVersion(QStringLiteral("0.8.8"));
+    RemoveGradationV0_8_8();
+    AddPieceUUIDV0_8_8();
+    Save();
+}
+
 //---------------------------------------------------------------------------------------------------------------------
 void VPatternConverter::ToV0_9_0()
 {

src/libs/ifc/xml/vpatternconverter.h

@@ -83,6 +83,7 @@ private:
     void ToV0_4_4();
     void ToV0_6_0();
     void ToV0_6_2();
+    void ToV0_8_8();
     void ToV0_9_0();
 
     void          TagUnitToV0_2_0();