Do not show the unsaved-edits dialog on a closing activity

CHANGELOG.md

@@ -22,6 +22,7 @@ section the body of the GitHub release, and refuses a version without one. `scri
 - Saving a spreadsheet computes array formulas, `NOW`, `TODAY`, `OFFSET`, `INDIRECT`, and
   formulas that refer to each other where the document allows it.
 - Excel dates in the short formats show as Excel shows them.
+- The app no longer crashes when it closes while a document has unsaved edits.
 
 ## 4.22.1
 

app/src/main/java/app/opendocument/droid/ui/activity/MainActivity.kt

@@ -841,6 +841,12 @@ class MainActivity : AppCompatActivity() {
      * come from.
      */
     fun confirmLeavingEdits(leave: () -> Unit) {
+        // onDestroy finishes the edit mode, which asks here: a dialog on a window that is going
+        // away throws BadTokenException. the edits go with the activity
+        if (isFinishing || isDestroyed) {
+            return
+        }
+
         val documentFragment = this.documentFragment
         if (documentFragment == null || !documentFragment.hasUnsavedEdits()) {
             leave()