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Compiled successfully toasts are stacking

3

Compiled successfully toasts are stacking high when you compile several times in a row. Not a breaking issue, more of an enhancement, perhaps compile notifications can go to the console...

IsUnionCaseTester throwing an error

13

2 issues with [IsUnionCaseTester](https://github.com/dotnet/fsharp/blob/c41720f08cb6fbb523bb9f052c92dd0f72540ef9/src/Compiler/Symbols/Symbols.fs#L1780): - Seems to be throwing an error, instead of returning `false` on non-matching values. - Seems to be missing a case where an union case tester...

- update to 5.0.7 - multi line / multi pane sample