lsp: remove outermost padding to remove border when exporting SVGs. #197
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Usually when exporting the graph with Sprotty, we just export the entire graph as-is. ELK has a default value for its padding of 12 pixels, which is also applied to the outermost invisible graph node, shifting all elements inwards by these 12 pixels.
This fix avoids that issue by removing the outermost padding before the layout on any graph, as that would be invisible anyways. With this, exported graphs will always be snug around the outermost graph elements.
Fixes kieler/klighd-vscode#46.