Fix bogus newline insertion on typing over multiple lines at end of document

FIX: Fix a bug where, when selecting full lines at the end of the document and inserting
a character on Chrome, an inappropriate extra newline was inserted.

See https://discuss.codemirror.net/t/extra-line-being-inserted/9620

Author: marijnh

src/domchange.ts

@@ -27,7 +27,7 @@ export class DOMChange {
       this.newSel = null
     } else if (start > -1 && (this.bounds = domBoundsAround(view.docView.tile, start, end, 0))) {
       let selPoints = iHead || iAnchor ? [] : selectionPoints(view)
-      let reader = new DOMReader(selPoints, view.state)
+      let reader = new DOMReader(selPoints, view)
       reader.readRange(this.bounds.startDOM, this.bounds.endDOM)
       this.text = reader.text
       this.newSel = selectionFromPoints(selPoints, this.bounds.from)

src/domreader.ts

@@ -1,5 +1,6 @@
 import {Tile} from "./tile"
 import {domIndex, maxOffset, isBlockElement} from "./dom"
+import {EditorView} from "./editorview"
 import {EditorState} from "@codemirror/state"
 
 export const LineBreakPlaceholder = "\uffff"
@@ -8,8 +9,8 @@ export class DOMReader {
   text: string = ""
   lineSeparator: string | undefined
 
-  constructor(private points: DOMPoint[], state: EditorState) {
-    this.lineSeparator = state.facet(EditorState.lineSeparator)
+  constructor(private points: DOMPoint[], private view: EditorView) {
+    this.lineSeparator = view.state.facet(EditorState.lineSeparator)
   }
 
   append(text: string) {
@@ -29,7 +30,7 @@ export class DOMReader {
       this.readNode(cur)
       let tile = Tile.get(cur), next: Node | null = cur.nextSibling
       if (next == end) {
-        if (tile?.breakAfter && !next) this.lineBreak()
+        if (tile?.breakAfter && !next && parent != this.view.contentDOM) this.lineBreak()
         break
       }
       let nextTile = Tile.get(next!)