feat: Add alt+click shortcut to copy cell and column headers

[georgecwan]

Adds a alt/opt+click shortcut to copy the value of a cell or column header.

Resolves #1585.

[codecov]

Codecov Report

Attention: 52 lines in your changes are missing coverage. Please review.

Comparison is base (9d519e1) 46.74% compared to head (1eb45ec) 46.65%.
Report is 2 commits behind head on main.

Files	Patch %	Lines
.../src/mousehandlers/IrisGridCopyCellMouseHandler.ts	15.38%	22 Missing ⚠️
packages/iris-grid/src/IrisGrid.tsx	23.52%	13 Missing ⚠️
packages/iris-grid/src/IrisGridCopyHandler.tsx	83.33%	7 Missing ⚠️
packages/grid/src/Grid.tsx	55.55%	4 Missing ⚠️
...d/src/mousehandlers/IrisGridContextMenuHandler.tsx	0.00%	4 Missing ⚠️
packages/grid/src/KeyHandler.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1694      +/-   ##
==========================================
- Coverage   46.74%   46.65%   -0.09%     
==========================================
  Files         606      607       +1     
  Lines       36762    36945     +183     
  Branches     9227     9294      +67     
==========================================
+ Hits        17184    17238      +54     
- Misses      19526    19655     +129     
  Partials       52       52              

Flag	Coverage Δ
unit	46.65% <48.51%> (-0.09%)	⬇️

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[mofojed]

Good start! Couple of things we can improve.

[mofojed]

I was debating if we should add support for Shortcut to handle mouse clicks... would be kind of interesting in that they could be configurable, but it's more of a headache than we need right now.

[mofojed]

@georgecwan you can test with copy permissions disabled by setting the permission flag on startup, e.g.:

START_OPTS="-Dinternal.webClient.appInit.canCopy=false" ./gradlew server-jetty-app:run -Pdebug -Ppsk=iris

[mofojed]

Something is strange with the snapshot function in general. When I'm trying to copy 100,000 rows, it's only copying 50,000. Table I'm using is:

from deephaven import empty_table
t = empty_table(100000).update(["X=i", "Y=i*i"])

I don't think related to your change though, seems to be in the JS API. Interesting. Logged it with ticket https://github.com/deephaven/web-client-ui/issues/1703 for further investigation.

Other than the minor handleKeyDown cleanup on Grid, should also write a unit test in IrisGridCopyHandler.test.tsx for the copy header cases.