Don't crash if terminal open and closed quickly - #6048

Don't crash if terminal open and closed quickly#6048

Tiedye wants to merge 1 commit into

xtermjs:masterxtermjs/xterm.js:masterfrom

Tiedye:fix/viewport-syncscrollarea-after-disposeTiedye/xterm.js:fix/viewport-syncscrollarea-after-disposeCopy head branch name to clipboard