cleanup: remove placeholder feature as it's now a monaco-editor builtin

README.md

@@ -4,7 +4,6 @@
 Monaco editor wrapper uses and configures [monaco-vscode-api](https://www.npmjs.com/package/@codingame/monaco-vscode-api) for you
 
 It also includes some tools allowing to add some missing features to monaco-editor:
-- placeholder
 - `preventAlwaysConsumeTouchEvent`, mobile feature corresponding to the `alwaysConsumeMouseWheel` monaco-editor option
 - `collapseCodeSections` allows to create and collapse a code section between 2 tokens
 - `registerTextDecorationProvider` allows to compute decorations on all existing editors

src/tools.ts

@@ -439,71 +439,6 @@ export function preventAlwaysConsumeTouchEvent (editor: monaco.editor.ICodeEdito
   })
 }
 
-// https://github.com/microsoft/monaco-editor/issues/568
-class PlaceholderContentWidget implements monaco.editor.IContentWidget {
-  private static readonly ID = 'editor.widget.placeholderHint'
-
-  private domNode: HTMLElement | undefined
-
-  constructor (
-    private readonly editor: monaco.editor.ICodeEditor,
-    private readonly placeholder: string
-  ) {}
-
-  getId (): string {
-    return PlaceholderContentWidget.ID
-  }
-
-  getDomNode (): HTMLElement {
-    if (this.domNode == null) {
-      this.domNode = document.createElement('pre')
-      this.domNode.style.width = 'max-content'
-      this.domNode.textContent = this.placeholder
-      this.domNode.style.pointerEvents = 'none'
-      this.domNode.style.color = '#aaa'
-      this.domNode.style.margin = '0'
-
-      this.editor.applyFontInfo(this.domNode)
-    }
-
-    return this.domNode
-  }
-
-  getPosition (): monaco.editor.IContentWidgetPosition | null {
-    return {
-      position: { lineNumber: 1, column: 1 },
-      preference: [monaco.editor.ContentWidgetPositionPreference.EXACT]
-    }
-  }
-}
-
-export function addPlaceholder (
-  editor: monaco.editor.ICodeEditor,
-  placeholder: string
-): monaco.IDisposable {
-  const disposableStore = new DisposableStore()
-
-  const widget = new PlaceholderContentWidget(editor, placeholder)
-
-  function onDidChangeModelContent (): void {
-    if (editor.getValue() === '') {
-      editor.addContentWidget(widget)
-    } else {
-      editor.removeContentWidget(widget)
-    }
-  }
-
-  onDidChangeModelContent()
-  disposableStore.add(editor.onDidChangeModelContent(onDidChangeModelContent))
-  disposableStore.add(editor.onDidChangeModel(onDidChangeModelContent))
-  disposableStore.add({
-    dispose () {
-      editor.removeContentWidget(widget)
-    }
-  })
-  return disposableStore
-}
-
 export function mapClipboard (
   editor: monaco.editor.ICodeEditor,
   {