Remove redundant getter `hasChanges`

There is already a getter `someUncommitedChanges` that does the same
job, so replace it with that.

Also turns out that `repo_tabs.vue` doesn't really use the properties
`hasChanges` and `mergeRequestId` it takes in, so that resulted in a lot
of dead code removal.

app/assets/javascripts/ide/components/activity_bar.vue

@@ -13,7 +13,7 @@ export default {
     tooltip,
   },
   computed: {
-    ...mapGetters(['hasChanges']),
+    ...mapGetters(['someUncommittedChanges']),
     ...mapState(['currentActivityView']),
   },
   methods: {
@@ -69,7 +69,7 @@ export default {
           <icon name="file-modified" />
         </button>
       </li>
-      <li v-show="hasChanges">
+      <li v-show="someUncommittedChanges">
         <button
           v-tooltip
           :class="{

app/assets/javascripts/ide/components/commit_sidebar/form.vue

@@ -26,7 +26,7 @@ export default {
   computed: {
     ...mapState(['changedFiles', 'stagedFiles', 'currentActivityView', 'lastCommitMsg']),
     ...mapState('commit', ['commitMessage', 'submitCommitLoading']),
-    ...mapGetters(['hasChanges']),
+    ...mapGetters(['someUncommittedChanges']),
     ...mapGetters('commit', ['discardDraftButtonDisabled', 'preBuiltCommitMessage']),
     overviewText() {
       return n__('%d changed file', '%d changed files', this.stagedFiles.length);
@@ -126,7 +126,7 @@ export default {
     >
       <div v-if="isCompact" ref="compactEl" class="commit-form-compact">
         <button
-          :disabled="!hasChanges"
+          :disabled="!someUncommittedChanges"
           type="button"
           class="btn btn-primary btn-sm btn-block qa-begin-commit-button"
           @click="toggleIsCompact"

app/assets/javascripts/ide/components/ide.vue

@@ -40,7 +40,6 @@ export default {
     ...mapState([
       'openFiles',
       'viewer',
-      'currentMergeRequestId',
       'fileFindVisible',
       'emptyStateSvgPath',
       'currentProjectId',
@@ -49,7 +48,6 @@ export default {
     ]),
     ...mapGetters([
       'activeFile',
-      'hasChanges',
       'someUncommittedChanges',
       'isCommitModeActive',
       'allBlobs',
@@ -108,14 +106,7 @@ export default {
       <div class="multi-file-edit-pane">
         <template v-if="activeFile">
           <commit-editor-header v-if="isCommitModeActive" :active-file="activeFile" />
-          <repo-tabs
-            v-else
-            :active-file="activeFile"
-            :files="openFiles"
-            :viewer="viewer"
-            :has-changes="hasChanges"
-            :merge-request-id="currentMergeRequestId"
-          />
+          <repo-tabs v-else :active-file="activeFile" :files="openFiles" :viewer="viewer" />
           <repo-editor :file="activeFile" class="multi-file-edit-pane-content" />
         </template>
         <template v-else>

app/assets/javascripts/ide/components/repo_commit_section.vue

@@ -16,7 +16,7 @@ export default {
   computed: {
     ...mapState(['changedFiles', 'stagedFiles', 'lastCommitMsg']),
     ...mapState('commit', ['commitMessage', 'submitCommitLoading']),
-    ...mapGetters(['lastOpenedFile', 'hasChanges', 'someUncommittedChanges', 'activeFile']),
+    ...mapGetters(['lastOpenedFile', 'someUncommittedChanges', 'activeFile']),
     ...mapGetters('commit', ['discardDraftButtonDisabled']),
     showStageUnstageArea() {
       return Boolean(this.someUncommittedChanges || this.lastCommitMsg);
@@ -26,8 +26,8 @@ export default {
     },
   },
   watch: {
-    hasChanges() {
-      if (!this.hasChanges) {
+    someUncommittedChanges() {
+      if (!this.someUncommittedChanges) {
         this.updateActivityBarView(leftSidebarViews.edit.name);
       }
     },

app/assets/javascripts/ide/components/repo_tabs.vue

@@ -20,15 +20,6 @@ export default {
       type: String,
       required: true,
     },
-    hasChanges: {
-      type: Boolean,
-      required: true,
-    },
-    mergeRequestId: {
-      type: String,
-      required: false,
-      default: '',
-    },
   },
   methods: {
     ...mapActions(['updateViewer', 'removePendingTab']),

app/assets/javascripts/ide/stores/getters.js

@@ -50,9 +50,6 @@ export const emptyRepo = state =>
 export const currentTree = state =>
   state.trees[`${state.currentProjectId}/${state.currentBranchId}`];
 
-export const hasChanges = state =>
-  Boolean(state.changedFiles.length) || Boolean(state.stagedFiles.length);
-
 export const hasMergeRequest = state => Boolean(state.currentMergeRequestId);
 
 export const allBlobs = state =>

spec/frontend/ide/components/repo_tabs_spec.js

@@ -16,9 +16,7 @@ describe('RepoTabs', () => {
     vm = createComponent(RepoTabs, {
       files: openedFiles,
       viewer: 'editor',
-      hasChanges: false,
       activeFile: file('activeFile'),
-      hasMergeRequest: false,
     });
     openedFiles[0].active = true;