message: Use ThemeIcons on hovers.
diff: @@ -52,18 +52,18 @@ export class GraphicsPreview {
  if (dataUrl.length < 99980) {
  md = new vscode.MarkdownString(`![graphics](${dataUrl})`)
  } else {
  - md = new vscode.MarkdownString('The file is too large to render.')
  + md = new vscode.MarkdownString('$(error) The file is too large to render.', true)
  }
  return md
  } else {
  if (/\.pdf$/i.exec(filePath)) {
  - let msg = 'Failed to render.'
  + let msg = '$(error) Failed to render.'
  if (!vscode.workspace.getWorkspaceFolder(vscode.Uri.file(filePath))) {
  - msg = 'Cannot render a PDF file not in workspaces.'
  + msg = '$(warning) Cannot render a PDF file not in workspaces.'
  } else if (!this.extension.snippetView.snippetViewProvider.webviewView) {
  - msg = 'Please activate Snippet View to render the thumbnail of a PDF file.'
  + msg = '$(info) Please activate Snippet View to render the thumbnail of a PDF file.'
  }
  - return new vscode.MarkdownString(msg)
  + return new vscode.MarkdownString(msg, true)
  }
  return undefined
  }
  