Merge Style Extension allows multiple uses of same class name, can lead to data corruption.

[Alvin Penner]

- this is using the new extension StyleSheet->Merge Styles, rev . 13164
- the problem occurs only if the same class name is used multiple times on the same file.

- draw 3 circles, colored R, G, B
- select all and apply StylesheetMerge
- note that one class called class1 is created in defs
- save as Styletest1.svg

[Alvin Penner (apenner)]

- select bottom two circles, green and blue
- apply StyleSheetMerge
- note that two classes called class1 are present in defs. The two classes are not the same.
- save as StyleTest2.svg

[Alvin Penner (apenner)]

- select bottom two circles again, green and blue
- apply StyleSheetMerge
- note that 3 classes called class1 are present in defs. The 3 classes are not the same.
- note that both circles are now green, blue is overwritten
- save as StyleTest3.svg

[su_v (suv-lp)]

@Martin - maybe you could take a closer look at this?

[Martin Owens (doctormo)]

Thanks for the heads up suv.

[Alvin Penner (apenner)]

it is no longer possible to test this extension on Windows 10,
the extensions fails,
Inkscape 1.0alpha (9cedb1b, 2019-02-08)