remove extra character when copy/paste

[suixy]

For PRJ-380 and PRJ-426, I believe that we can merely send copy/paste events to projector-server without the extra "c" and "v", aiming at avoiding the useless character displayed in the terminal.

[SerVB]

Thank you for the PR. I can't review it well right now, I hope I will return to it in two weeks or so.

But I've checked briefly and I think there is a better place for blocking the press event:

projector-client/projector-client-web/src/main/kotlin/org/jetbrains/projector/client/web/input/key/Util.kt

Lines 191 to 200 in ead58ab

	if (type == ClientKeyEvent.KeyEventType.DOWN && message.code !in invisibleCodes) {
	// we've blocked special keys like Tab to stop the browser react
	// but we also disabled generation of PRESS events
	// so need to send them manually
	this@fireKeyEvent(ClientKeyPressEvent(
	timeStamp = message.timeStamp,
	char = message.char,
	modifiers = message.modifiers,
	))
	}

Anyway, need to check if it's the same behavior as Swing does when pressing copy and paste keystrokes. If Swing sends a KEY_TYPED event, then we should do it too and solve PRJ-380 and PRJ-426 in some other way...

[codecov-commenter]

Codecov Report

Merging #92 (d2c155a) into master (ead58ab) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master      #92      +/-   ##
============================================
- Coverage     22.18%   22.18%   -0.01%     
  Complexity       57       57              
============================================
  Files           160      160              
  Lines          4142     4143       +1     
  Branches        576      577       +1     
============================================
  Hits            919      919              
- Misses         3201     3202       +1     
  Partials         22       22              

Impacted Files	Coverage Δ
...etbrains/projector/client/web/state/ClientState.kt	0.00% <0.00%> (ø)

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[SerVB]

Well, looks like I'm stuck with rendering-related tickets now and I can't spend time on digging into keyboard problems in the near future.

As I noted before, this PR can't be accepted as is: some changes are required at least, and some research is needed too.

So let me postpone the review of this PR.