HackStudio: Resize editors when removing panes

Splitter does weird things when you resize and then remove children.
This works around the limitation by forcing at least one of the editors
to fill the space. It's janky, but at least doesn't result in the last
editor not filling the window.

Userland/DevTools/HackStudio/HackStudioWidget.cpp

@@ -553,6 +553,18 @@ NonnullRefPtr<GUI::Action> HackStudioWidget::create_remove_current_editor_action
         auto wrapper = m_current_editor_wrapper;
         m_switch_to_next_editor->activate();
         m_editors_splitter->remove_child(*wrapper);
+
+        auto child_editors = m_editors_splitter->child_widgets();
+        bool has_child_to_fill_space = false;
+        for (auto& editor : child_editors) {
+            if (editor.max_height() == -1) {
+                has_child_to_fill_space = true;
+                break;
+            }
+        }
+        if (!has_child_to_fill_space)
+            child_editors.last().set_max_height(-1);
+
         m_all_editor_wrappers.remove_first_matching([&wrapper](auto& entry) { return entry == wrapper.ptr(); });
         update_actions();
     });