Implement workaround for flatpak QFile::moveToTrash

CMakeLists.txt

@@ -25,6 +25,7 @@ set(TENMON_SRC
     about.cpp
     database.cpp
     databaseview.cpp
+    delete.cpp
     filesystemwidget.cpp
     imageinfo.cpp
     imageringlist.cpp
@@ -63,6 +64,8 @@ elseif(APPLE)
 else()
     add_compile_definitions("__PCL_LINUX")
     set(tenmon_ICON "")
+    find_package(PkgConfig REQUIRED)
+    pkg_search_module(GIO REQUIRED gio-2.0)
 endif()
 
 add_executable(tenmon WIN32 MACOSX_BUNDLE ${tenmon_ICON} ${TENMON_SRC})
@@ -76,13 +79,14 @@ elseif(APPLE)
     target_link_directories(tenmon PRIVATE 3rdparty/lib/MacOS)
 else()
     target_link_directories(tenmon PRIVATE 3rdparty/lib/Linux)
+    target_include_directories(tenmon PRIVATE ${GIO_INCLUDE_DIRS})
 endif()
 
 target_link_libraries(tenmon Qt5::Widgets Qt5::Sql ${OpenCV_LIBS} ${GSL_LIB} ${GSLCBLAS_LIB} ${EXIF_LIB} ${FITS_LIB} ${RAW_LIB} ${WCS_LIB})
 if(APPLE)
     target_link_libraries(tenmon PCL-pxi lcms-pxi lz4-pxi RFC6234-pxi zlib-pxi "-framework CoreFoundation")
 else()
-    target_link_libraries(tenmon PCL lcms lz4  RFC6234 zlib)
+    target_link_libraries(tenmon PCL lcms lz4  RFC6234 zlib ${GIO_LDFLAGS})
 endif(APPLE)
 
 if(LIBRAW_STATIC)