[cherry-pick] show staging area with preset message for commit when changelists are disabled

GitOrigin-RevId: 67d437970773c35a2048af7599ebd4e53ed0ec8a

plugins/git4idea/src/git4idea/GitApplyChangesProcess.kt

@@ -7,6 +7,7 @@ import com.intellij.notification.Notification
 import com.intellij.notification.NotificationListener
 import com.intellij.openapi.application.ApplicationManager
 import com.intellij.openapi.application.ModalityState
+import com.intellij.openapi.application.runInEdt
 import com.intellij.openapi.diagnostic.logger
 import com.intellij.openapi.project.Project
 import com.intellij.openapi.util.NlsSafe
@@ -32,6 +33,7 @@ import git4idea.commands.GitSimpleEventDetector.Event.CHERRY_PICK_CONFLICT
 import git4idea.commands.GitSimpleEventDetector.Event.LOCAL_CHANGES_OVERWRITTEN_BY_CHERRY_PICK
 import git4idea.commands.GitUntrackedFilesOverwrittenByOperationDetector
 import git4idea.i18n.GitBundle
+import git4idea.index.showStagingArea
 import git4idea.merge.GitConflictResolver
 import git4idea.merge.GitDefaultMergeDialogCustomizer
 import git4idea.repo.GitRepository
@@ -180,7 +182,12 @@ class GitApplyChangesProcess(private val project: Project,
                      changeList: LocalChangeList,
                      successfulCommits: MutableList<VcsFullCommitDetails>,
                      alreadyPicked: MutableList<VcsFullCommitDetails>): Boolean {
-    if (!changeListManager.areChangeListsEnabled()) return false
+    if (!changeListManager.areChangeListsEnabled()) {
+      runInEdt {
+        showStagingArea(project, commitMessage)
+      }
+      return false
+    }
 
     val actualList = changeListManager.getChangeList(changeList.id)
     if (actualList == null) {

plugins/git4idea/src/git4idea/index/GitStageContentProvider.kt

@@ -11,8 +11,11 @@ import com.intellij.openapi.vcs.changes.ui.ChangesViewContentManagerListener
 import com.intellij.openapi.vcs.changes.ui.ChangesViewContentProvider
 import com.intellij.ui.content.Content
 import com.intellij.util.NotNullFunction
+import com.intellij.util.concurrency.annotations.RequiresEdt
+import com.intellij.util.ui.UIUtil
 import com.intellij.vcs.commit.CommitTabTitleUpdater
 import com.intellij.vcsUtil.VcsUtil
+import git4idea.index.GitStageContentProvider.Companion.STAGING_AREA_TAB_NAME
 import git4idea.index.ui.GitStagePanel
 import org.jetbrains.annotations.Nls
 import org.jetbrains.annotations.NonNls
@@ -71,4 +74,22 @@ class GitStageContentVisibilityPredicate : NotNullFunction<Project, Boolean> {
 
 class GitStageDisplayNameSupplier : Supplier<String> {
   override fun get(): @Nls String = VcsBundle.message("tab.title.commit")
+}
+
+@RequiresEdt
+fun showStagingArea(project: Project, commitMessage: String) {
+  showStagingArea(project) {
+    it.setCommitMessage(commitMessage)
+  }
+}
+
+private fun showStagingArea(project: Project, consumer: (GitStagePanel) -> Unit) {
+  val toolWindow = ChangesViewContentManager.getToolWindowFor(project, STAGING_AREA_TAB_NAME) ?: return
+  toolWindow.activate({
+                        val contentManager = ChangesViewContentManager.getInstance(project) as ChangesViewContentManager
+                        val content = contentManager.findContents { it.tabName == STAGING_AREA_TAB_NAME }.singleOrNull() ?: return@activate
+
+                        contentManager.setSelectedContent(content, true)
+                        (content.component as? GitStagePanel)?.let(consumer)
+                      }, true)
 }

plugins/git4idea/src/git4idea/index/ui/GitStagePanel.kt

@@ -155,6 +155,10 @@ internal class GitStagePanel(private val tracker: GitStageTracker, isEditorDiffP
     }
   }
 
+  internal fun setCommitMessage(commitMessage: String) {
+    commitPanel.commitMessage.setCommitMessage(commitMessage)
+  }
+
   override fun dispose() {
   }