Improve table selection (#3167)

Author: JiuqingSong

packages/roosterjs-content-model-core/lib/corePlugin/selection/SelectionPlugin.ts

@@ -559,6 +559,10 @@ class SelectionPlugin implements PluginWithState<SelectionPluginState> {
 
             range.setStart(posStart.node, posStart.offset);
             range.setEnd(posEnd.node, posEnd.offset);
+
+            if (range.toString() === '') {
+                range.collapse(true /* toStart */);
+            }
         } else {
             // Get deepest editable position in the cell
             const { node, offset } = normalizePos(cell, nodeOffset);

packages/roosterjs-content-model-plugins/lib/edit/EditPlugin.ts

@@ -177,9 +177,7 @@ export class EditPlugin implements EditorPlugin {
         ) {
             const selection = this.editor.getDOMSelection();
             const startContainer =
-                selection?.type == 'range' && selection.range.collapsed
-                    ? selection.range.startContainer
-                    : null;
+                selection?.type == 'range' ? selection.range.startContainer : null;
             const table = startContainer
                 ? this.editor.getDOMHelper().findClosestElementAncestor(startContainer, 'table')
                 : null;
@@ -320,4 +318,4 @@ export class EditPlugin implements EditorPlugin {
                 return false;
         }
     }
-}
+}