Tables: fixed TableGetHoveredRow() (#7350, #6588, #6250) + TableGetRowIndex() which never correctly worked when using a clipper.

Amend e09454aec. Can't understand the comment nor why code was commented. Code looks alright. Compared TableEndRow() between 1.80 and current as well.

imgui.cpp

@@ -3125,7 +3125,7 @@ static void ImGuiListClipper_SeekCursorAndSetupPrevLine(float pos_y, float line_
             ImGui::TableEndRow(table);
         table->RowPosY2 = window->DC.CursorPos.y;
         const int row_increase = (int)((off_y / line_height) + 0.5f);
-        //table->CurrentRow += row_increase; // Can't do without fixing TableEndRow()
+        table->CurrentRow += row_increase;
         table->RowBgColorCounter += row_increase;
     }
 }