message: undo button tweak
diff: @@ -119,7 +119,7 @@ class ComponentEditorControls extends PurePluginUIComponent<{}, ComponentEditorC
  <ToggleButton icon='bookmarks' label='Preset' toggle={this.togglePreset} isSelected={this.state.action === 'preset'} disabled={this.isDisabled} />
  <ToggleButton icon='plus' label='Add' toggle={this.toggleAdd} isSelected={this.state.action === 'add'} disabled={this.isDisabled} />
  <ToggleButton icon='cog' label='Options' toggle={this.toggleOptions} isSelected={this.state.action === 'options'} disabled={this.isDisabled} />
  - <IconButton customClass='msp-flex-item' style={{ flex: '0 0 40px' }} onClick={this.undo} disabled={!this.state.canUndo} icon='ccw' title='Some mistakes of the past can be undone.' />
  + <IconButton customClass='msp-flex-item' style={{ flex: '0 0 40px' }} onClick={this.undo} disabled={!this.state.canUndo || this.isDisabled} icon='ccw' title='Some mistakes of the past can be undone.' />
  </div>
  {this.state.action === 'preset' && this.presetControls}
  {this.state.action === 'add' && <div className='msp-control-offset'>
  