Cursor position gets lost when switching tabs

[CoenraadS]

Expected behaviour

The cursor position gets lost when switching tabs, making it very inconvient to always re-place the cursor.

Expectations: When I have a file with only a mermaid file in it, that should be shown by default with no cursor (i.e check first line of file)

When I do have a cursor inside a fence, and then the cursor gets lost (by switching tabs or something else), it should display the last good diagram.

Actual behaviour

It always jumps to

diagram is rendered when the
cursor is inside the fence

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