Existing trees should react to changes to `workbench.list.defaultFindMode` (#156581)
Existing trees should react to changes to `workbench.list.defaultFindMode` (#156581)

fixes #156249
microsoft/vscode,microsoft/vscode,microsoft/vscode,microsoft/vscode,microsoft/vscode,microsoft/vscode,microsoft/vscode,microsoft/vscode,microsoft/vscode,microsoft/vscode,microsoft/vscode,microsoft/vscode,microsoft/vscode,microsoft/vscode,microsoft/vscode,microsoft/vscode,microsoft/vscode