[blockly] Add multi-select feature

[jimtng]

• Shift + Click to select multiple blocks
• Also shift + mouse drag to multi-select
• Currently multiselect doesn't work on mobile (AFAIK) but copy/pasting even across different scripts works
• Provides cross tab copy/paste, including copy/pasting multiple selected blocks.

The multi-select plugin conflicts with the cross-tab-copy-paste plugin and makes it redundant, so it is removed in this PR

Also in this PR, make two fingers do panning instead of zooming.

These have been split into three commits for granularity so please don't squash them.

Resolve #2417

[relativeci]

Job #1728: Bundle Size — 11.11MiB (+0.74%).

f4bd025(current) vs 5997c28 main#1726(baseline)

Warning

Bundle contains 19 duplicate packages – View duplicate packages

Warning

Bundle introduced 2 new packages: @mit-app-inventor/blockly-plugin-workspace-multiselect, dragselect – View changed packages

Bundle metrics   4 changes 1 regression 1 improvement

	Current Job #1728	Baseline Job #1726
Initial JS	1.85MiB	1.85MiB
Initial CSS	607.92KiB	607.92KiB
Cache Invalidation	18.48%	17.29%
Chunks	220	220
Assets	242	242
Modules	3097(+0.23%)	3090
Duplicate Modules	164	164
Duplicate Code	1.75%(-1.13%)	1.77%
Packages	151(+0.67%)	150
Duplicate Packages	18	18

Bundle size by type   1 change 1 regression

	Current Job #1728	Baseline Job #1726
JS	9.3MiB (+0.88%)	9.22MiB
CSS	889.4KiB	889.4KiB
Fonts	526.1KiB	526.1KiB
Media	295.6KiB	295.6KiB
IMG	140.74KiB	140.74KiB
HTML	1.24KiB	1.24KiB
Other	871B	871B

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View job #1728 report View jimtng:blockly-multi-select branch activity View project dashboard

[rkoshak]

Thank you!

This was really annoying when I was trying to do some testing of my block library.

[stefan-hoehn]

Though, I am a bit(!) hesitant to add it. I also saw it as wel but note that is not supported by the blockly maintainers.

On the other hand, app inventor has a huge amount of resources, so I think it won't be an issue.
I will give it try and test it first, though

[stefan-hoehn]

I also need to check closely that it removes the cross-tab-plugin.
Jimmy, please keep in mind that it is not only about adding new features but they also should be consistent what the users have used in the past. And it MUST be documented as well (sometimes that takes more time than the actual implementation).
So without having looked at it in detail yet, I am kind of worried because of the cross-rule-copy/paste.

[stefan-hoehn]

So copy and paste across rules still work. That's good.

But when you shift-click blocks and then do a copy of them and exception is thrown in the background and you can't go on except that you have the blocks clinging to your mouse:

See the attached

error.mov

[jimtng]

@stefan-hoehn I've updated a patch although I'll open a PR on the multi-select repo to have it fixed there too. But this means we can merge this now instead of waiting.

This is fixed in v0.1.12 which I have updated in this PR. It's added as a separate commit for you to see the changes, but I can squash it into the corresponding commit before merging.

Could you please test it again?

[stefan-hoehn]

Ok, I tested it again and from what I see it looks good.

Can you please not only provide this PR but also the PR that updates the docs accordingly 🙏🏻, so the users are not confused as we had "cross rule copy" before and now the new behaviour. Also multiselect should be described.

So in particular https://next.openhab.org/docs/configuration/blockly/rules-blockly-before-using.html#cross-rule-copy-paste should be updated at best with a new animated gif that explains how to use the new functionality.

[florian-h05]

LGTM. I just had a look at it, and this is a really nice feature!

[florian-h05]

@jimtng FYI I updated the commit messages a bit so these contain a reference to this PR when I rebase.