docs(screenshots): show real MIDI input devices in preferences dropdown

docs/ROADMAP.md

@@ -2320,6 +2320,12 @@ Implemented: all 66 gallery PNGs were refreshed, including five new MIDI prefere
 
 ---
 
+Follow-up screenshot: [open MIDI input device dropdown](../screenshots/preferences-midi-input-devices.png)
+shows actual host MIDI sources after the label-lifetime fix. The reproducible
+`XTC_CAPTURE_MIDI_INPUT_ONLY=1` capture uses the real preferences dropdown and
+leaves device routing/configuration unchanged. Warning-enabled capture build,
+successful capture and visual inspection confirmed readable device names.
+
 ## Integrated Validation for Phases 100–105
 
 Completed on 2026-11-06. Normal builds use `BUILD_DIR=build/audio-editor`:

screenshots/README.md

@@ -17,6 +17,7 @@ floating views show the actual detached windows together.
 
 ## MIDI devices, defaults and file exchange (Phases 100–105)
 
+- [Open MIDI input dropdown with real host devices](preferences-midi-input-devices.png)
 - [MIDI source/destination preferences and channel defaults](preferences-midi.png)
 - [Device setup and MIDI defaults help](preferences-midi-help.png)
 - [File menu with MIDI import and selected-clip export](midi-file-menu.png)
@@ -32,6 +33,13 @@ See [MIDI workflows and limits](../docs/MIDI_WORKFLOWS.md).
 Reproduce these five captures with
 `XTC_CAPTURE_MIDI_ONLY=1 make BUILD_DIR=build/audio-editor screenshots`.
 
+The open input dropdown was captured after the device-label lifetime fix. It
+shows actual host sources, including UMC204HD, USB MIDI, Oxygen Pro 25 and BLE
+MIDI ports. No route is selected and user preferences are preserved. Reproduce
+just this image with real MIDI sources exposed by JACK/PipeWire:
+`XTC_CAPTURE_MIDI_INPUT_ONLY=1 make BUILD_DIR=build/audio-editor screenshots`.
+The capture fails explicitly if the host exposes no input sources.
+
 ## Creative workflows (Phases 90–99)
 
 Four real captures show the current transport Tap button, insert meters and

tools/capture_screenshots.cpp

@@ -13,6 +13,7 @@
 #include <FL/Fl_Menu_Bar.H>
 #include <FL/Fl_Button.H>
 #include <FL/Fl_Choice.H>
+#include <FL/Fl_Input_Choice.H>
 #include <FL/Fl_Scroll.H>
 #include <FL/x.H>
 #include <chrono>
@@ -63,6 +64,26 @@ int main(int argc,char **argv) {
         MainWindow window(false,"");main_window=&window;window.resize(0,0,1400,900);window.show();check(window.open_project(project.c_str()));pump();
         auto *s=first<SequencerWidget>(window);if(!s)throw std::runtime_error("Sequencer missing");
         auto reset=[&](){window.reset_layout();check(window.open_project(project.c_str()));window.resize(0,20,1400,900);tab("Sequencer");s->select(0,0);s->position(0);check(window.set_loop(3840,7680,true));window.fit_song();pump();};
+        if(std::getenv("XTC_CAPTURE_MIDI_INPUT_ONLY")) {
+            reset();
+            if(window.midi_devices(true).empty())throw std::runtime_error("No real MIDI input sources exposed by the host");
+            Fl::add_timeout(.3,[](void*){
+                auto *preferences=Fl::modal();if(!preferences)throw std::runtime_error("Preferences missing");
+                auto *tabs=first<Fl_Tabs>(*preferences);auto *page=named(*preferences,"midi");
+                if(!tabs || !page)throw std::runtime_error("MIDI preferences missing");
+                tabs->value(page);tabs->redraw();pump();
+                auto *choice=dynamic_cast<Fl_Input_Choice *>(named(*preferences,"Default MIDI input source (next Play)"));
+                if(!choice || choice->menubutton()->size()<3)throw std::runtime_error("MIDI source list is empty");
+                Fl::add_timeout(.3,[](void*){
+                    capture("preferences-midi-input-devices");
+                    if(system("xdotool key Escape"))std::abort();
+                });
+                choice->menubutton()->popup();
+                auto *close=named(*preferences,"Close");if(!close)throw std::runtime_error("Preferences close missing");close->do_callback();
+            });
+            window.show_preferences();window.do_callback();
+            std::puts("Real host MIDI input device dropdown captured.");return 0;
+        }
         if(std::getenv("XTC_CAPTURE_MIDI_ONLY")) {
             reset();dialog("preferences-midi",[&]{window.show_preferences();},"midi");
             dialog("preferences-midi-help",[&]{window.show_preferences();},"MIDI help");