fix(edgeless): fix laggy selection & legacy template rendering

[doouding]

Change

• Add new method walk into transformer Job to traverse a template (use to modify the snapshot content before importing start)
• Add property fallback to fix legacy template rendering
• Add watch decorator to watch element property change
• Add new local property commands to brush to avoid double computation
• Fix laggy multi-selection

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[doodlewind]

Could you elaborate about how the multi-selection is optimized and how is the measured result? Thanks.

It's weird that I haven't observed the laggy case in the windows laptop in current master, so the perf update could really be subjective for the moment.

[doouding]

Could you elaborate about how the multi-selection is optimized and how is the measured result? Thanks.

It's weird that I haven't observed the laggy case in the windows laptop in current master, so the perf update could really be subjective for the moment.

Well, I recorded the performance of the multi-selection action and eliminated the unnecessary render and computation during the action to reduce the frame times. It may still take some time with CPU 6x slow down, but it's better than before optimization.

Before

After

But like you said, the next step that needs to be done more than anything else is a stable performance metrics testing.