Support multi-selections in awareness #22
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This PR is to support multi-selections in awareness, which is requested in #18.
createSelectionAnchorAndHead
andcreateRemoteSelectionDecoration
.secondarySelections
, which is used to render decorations for secondary selections.createRelativeSelection
tocreateRelativeSelections
, saving all current selections instead of only one.yRemoteSelection-primary
,yRemoteSelectionHead-primary
,yRemoteSelection-secondary
,yRemoteSelectionHead-secondary
for multi-selection styling, and added corresponding CSS in the demo file.Demo:
2024-01-29.6.45.14.mp4
cc @dmonad
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