fix: keyboard shortcut formatting error fix. Fixes #416

lib/src/editor/command/text_commands.dart

@@ -174,6 +174,21 @@ extension TextTransforms on EditorState {
     );
   }
 
+  static const whiteSpaceCharacter = " ";
+  // A function to check if the character before the selection is a white space.
+  // Returs true if the character is a white space, false otherwise.
+  bool iswhiteSpaceBeforeSelected(Selection selection) {
+    if (selection.end.offset == 0) {
+      return false;
+    }
+    return getTextInSelection(
+          selection.copyWith(
+            start: selection.end.copyWith(offset: selection.end.offset - 1),
+            end: selection.end.copyWith(offset: selection.end.offset),
+          ),
+        ).first == whiteSpaceCharacter;
+  }
+
   /// Toggles the given attribute on or off for the selected text.
   ///
   /// If the [Selection] is not passed in, use the current selection.
@@ -186,6 +201,29 @@ extension TextTransforms on EditorState {
       return;
     }
     final nodes = getNodesInSelection(selection);
+// If the selection is collapsed, insert a white space character at the current selection. and format it.
+    if (selection.length == 0) {
+      if (selection.end.offset == 0) {
+        insertTextAtCurrentSelection(whiteSpaceCharacter);
+        selection = selection.copyWith(
+          start: selection.end.copyWith(offset: selection.end.offset),
+          end: selection.end.copyWith(offset: selection.end.offset + 1),
+        );
+      } else {
+        if (iswhiteSpaceBeforeSelected(selection)) {
+          selection = selection.copyWith(
+            start: selection.end.copyWith(offset: selection.end.offset - 1),
+            end: selection.end.copyWith(offset: selection.end.offset),
+          );
+        } else {
+          insertTextAtCurrentSelection(whiteSpaceCharacter);
+          selection = selection.copyWith(
+            start: selection.end.copyWith(offset: selection.end.offset),
+            end: selection.end.copyWith(offset: selection.end.offset + 1),
+          );
+        }
+      }
+    }
     final isHighlight = nodes.allSatisfyInSelection(selection, (delta) {
       return delta.everyAttributes(
         (attributes) => attributes[key] == true,