Add a decoration order setting for each registered plugin

lib/mixins/plugin-management.js

@@ -178,21 +178,39 @@ export default class PluginManagement extends Mixin {
    * @access private
    */
   registerPluginControls (name, plugin) {
-    let settingsKey = `minimap.plugins.${name}`
+    const settingsKey = `minimap.plugins.${name}`
+    const orderSettingsKey = `minimap.plugins.${name}DecorationsOrder`
 
     this.config.plugins.properties[name] = {
       type: 'boolean',
+      title: name,
+      description: `Whether the ${name} plugin is activated and displayed in the Minimap.`,
       default: true
     }
 
+    this.config.plugins.properties[`${name}DecorationsOrder`] = {
+      type: 'integer',
+      title: `${name} decorations order`,
+      description: `The relative order of the ${name} plugin's decorations in the layer into which they are drawn. Note that this order only apply inside a layer, so highlight-over decorations will always be displayed above line decorations as they are rendered in different layers.`,
+      default: 0
+    }
+
     if (atom.config.get(settingsKey) === undefined) {
       atom.config.set(settingsKey, true)
     }
 
+    if (atom.config.get(orderSettingsKey) === undefined) {
+      atom.config.set(orderSettingsKey, 0)
+    }
+
     this.pluginsSubscriptions[name].add(atom.config.observe(settingsKey, () => {
       this.updatesPluginActivationState(name)
     }))
 
+    this.pluginsSubscriptions[name].add(atom.config.observe(orderSettingsKey, () => {
+
+    }))
+
     this.pluginsSubscriptions[name].add(atom.commands.add('atom-workspace', {
       [`minimap:toggle-${name}`]: () => {
         this.togglePluginActivation(name)

spec/minimap-main-spec.js

@@ -147,10 +147,12 @@ describe('Minimap package', () => {
 
       it('creates a default config for the plugin', () => {
         expect(minimapPackage.config.plugins.properties.dummy).toBeDefined()
+        expect(minimapPackage.config.plugins.properties.dummyDecorationsOrder).toBeDefined()
       })
 
       it('sets the corresponding config', () => {
         expect(atom.config.get('minimap.plugins.dummy')).toBeTruthy()
+        expect(atom.config.get('minimap.plugins.dummyDecorationsOrder')).toEqual(0)
       })
 
       describe('triggering the corresponding plugin command', () => {