Fix segfault when opening recent file with pattern sync; Don't show p… (#2448)

…attern selection popup when pattern is already open

This PR does two things. Most importantly, it fixes a segfault that can
be caused by opening a recent file with pattern sync enabled.
Secondly, it makes it so that the pattern selection popup does not
appear if you already have text in the pattern editor for a given
provider (due to CLI args, a project file, pattern sync, etc.). If you
open a file normally, that text field is empty and the popup will appear
so you can select a pre-made pattern like usual.

plugins/builtin/source/content/views/view_pattern_editor.cpp

@@ -45,6 +45,7 @@
 #include <fonts/fonts.hpp>
 #include <hex/api/events/requests_gui.hpp>
 #include <hex/helpers/menu_items.hpp>
+#include <hex/helpers/logger.hpp>
 
 namespace hex::plugin::builtin {
 
@@ -70,6 +71,16 @@ namespace hex::plugin::builtin {
                 return;
             }
 
+            ui::TextEditor *editor = m_view->getTextEditor();
+            if (editor != nullptr) {
+                if (!editor->isEmpty()) {
+                    this->close();
+                    return;
+                }
+            } else {
+                log::warn("Text editor not found, provider is null");
+            }
+
             ImGuiExt::TextFormattedWrapped("{}", static_cast<const char *>("hex.builtin.view.pattern_editor.accept_pattern.desc"_lang));
 
             if (ImGui::BeginListBox("##patterns_accept", ImVec2(400_scaled, 0))) {