Fix: check if path tool is interacting with raster layer to prevent crashing.

[KartikSharma0]

Resolves #2687
Added a check that returns PathToolFsmState::Ready if the path tool is used on a raster layer.

[Keavon]

!build

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[KartikSharma0]

Video of the fix:

Graphite.path.tool.bugfix.mov

[KartikSharma0]

Please let me know if the video above captures the expected behavior.

[Keavon]

This does not remove anchors from the corners of the image. All it does is break the Path tool's ability to select stuff, either a box selection or even clicking on other valid points if multiple layers (including actual vector layers) are selected. Please give it another shot so it addresses the requested change (first sentence of this reply).

[KartikSharma0]

So there shouldn't be any anchors displayed on the image at all when the path tool is selected? The path tool still works on the spline as shown, it's just ignoring the raster image.

[KartikSharma0]

I added a check before showing the anchors/handles. Please let me know if this PR is in-line with what you expected now.

[KartikSharma0]

Okay, I simplified the code changes. I think this PR should fulfill the requirements now.

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