Fix a bug where an empty text view is considered non-empty.

Creating a multiline message and deleting all of it leaves a single <p> tag in the model which we need to ignore.

Author: pixlwave

crates/wysiwyg/src/composer_model/delete_text.rs

@@ -52,7 +52,7 @@ where
         if s == e {
             // We have no selection - check for special list behaviour
             // TODO: should probably also get inside here if our selection
-            // only contains a zero-wdith space.
+            // only contains a zero-width space.
             let range = self.state.dom.find_range(s, e);
             self.backspace_single_cursor(range)
         } else {

platforms/ios/lib/WysiwygComposer/Sources/WysiwygComposer/Components/WysiwygComposerView/WysiwygComposerViewModel.swift

@@ -154,7 +154,7 @@ public class WysiwygComposerViewModel: WysiwygComposerViewModelProtocol, Observa
         model.delegate = self
         // Publish composer empty state.
         $attributedContent.sink { [unowned self] content in
-            isContentEmpty = content.text.length == 0
+            isContentEmpty = content.text.length == 0 || content.plainText == "\n" // An empty <p> is left when deleting multi-line content.
         }
         .store(in: &cancellables)
 

platforms/ios/lib/WysiwygComposer/Tests/WysiwygComposerTests/Components/WysiwygComposerView/WysiwygComposerViewModelTests.swift

@@ -56,6 +56,21 @@ final class WysiwygComposerViewModelTests: XCTestCase {
         // Then the content should be empty for the placeholder to be shown.
         XCTAssertTrue(viewModel.isContentEmpty)
     }
+    
+    func testIsContentEmptyAfterDeletingMultilineContent() {
+        // When typing a new line.
+        _ = viewModel.replaceText(range: .zero, replacementText: "\n")
+        viewModel.textView.attributedText = NSAttributedString(string: "\n")
+        viewModel.didUpdateText()
+        
+        // And then deleting that new line.
+        _ = viewModel.replaceText(range: .init(location: 0, length: 1), replacementText: "")
+        viewModel.textView.attributedText = NSAttributedString(string: "")
+        viewModel.didUpdateText()
+        
+        // Then the content should be empty for the placeholder to be shown.
+        XCTAssertTrue(viewModel.isContentEmpty)
+    }
 
     func testSimpleTextInputIsAccepted() throws {
         let shouldChange = viewModel.replaceText(range: .zero,