Moving fltk-rs/fltk-rs#797 to here.

Looks like the Tooltip widget is causing the app window to unfocus.

#include <FL/Fl.H>
#include <FL/Fl_Window.H>
#include <FL/Fl_Button.H>
#include <FL/Fl_Pack.H>

int main() {
  Fl_Window win(400, 300, "Window");
  Fl_Pack pack(160, 20, 80, 300);
  pack.spacing(5);
  for (int i = 0; i < 5; i++) {
    auto btn = new Fl_Button(0, 0, 0, 40, "Button");
    btn->tooltip("Button");
  }
  pack.end();
  win.end();
  win.show();
  win.redraw();
  return Fl::run();
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.15)
project(monitors)

include(FetchContent)

set(FLTK_BUILD_TEST OFF CACHE BOOL " " FORCE)
set(OPTION_USE_GDIPLUS ON CACHE BOOL " " FORCE)

FetchContent_Declare(FLTK
    GIT_REPOSITORY https://github.com/fltk/fltk
    GIT_SHALLOW TRUE
)
FetchContent_MakeAvailable(FLTK)

add_executable(main main.cpp)
target_link_libraries(main PRIVATE fltk gdiplus)
target_include_directories(main PRIVATE ${fltk_SOURCE_DIR} ${fltk_BINARY_DIR})
target_link_libraries(main PRIVATE fltk)

build.bat

cmake -S. -Bbin -DCMAKE_BUILD_TYPE=Release && cmake --build bin --config Release

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