Respect spellcheck/autocorrect/autocapitalize options in textarea input style

Issue https://github.com/codemirror/codemirror5/issues/7009

src/input/ContentEditableInput.js

@@ -94,6 +94,7 @@ export default class ContentEditableInput {
       }
       // Old-fashioned briefly-focus-a-textarea hack
       let kludge = hiddenTextarea(), te = kludge.firstChild
+      disableBrowserMagic(te)
       cm.display.lineSpace.insertBefore(kludge, cm.display.lineSpace.firstChild)
       te.value = lastCopied.text.join("\n")
       let hadFocus = activeElt(div.ownerDocument)

src/input/TextareaInput.js

@@ -1,6 +1,6 @@
 import { operation, runInOp } from "../display/operations.js"
 import { prepareSelection } from "../display/selection.js"
-import { applyTextInput, copyableRanges, handlePaste, hiddenTextarea, setLastCopied } from "./input.js"
+import { applyTextInput, copyableRanges, handlePaste, hiddenTextarea, disableBrowserMagic, setLastCopied } from "./input.js"
 import { cursorCoords, posFromMouse } from "../measurement/position_measurement.js"
 import { eventInWidget } from "../measurement/widgets.js"
 import { simpleSelection } from "../model/selection.js"
@@ -117,6 +117,8 @@ export default class TextareaInput {
     // The semihidden textarea that is focused when the editor is
     // focused, and receives input.
     this.textarea = this.wrapper.firstChild
+    let opts = this.cm.options
+    disableBrowserMagic(this.textarea, opts.spellcheck, opts.autocorrect, opts.autocapitalize)
   }
 
   screenReaderLabelChanged(label) {

src/input/input.js

@@ -130,6 +130,5 @@ export function hiddenTextarea() {
   else te.setAttribute("wrap", "off")
   // If border: 0; -- iOS fails to open keyboard (issue #1287)
   if (ios) te.style.border = "1px solid black"
-  disableBrowserMagic(te)
   return div
 }