Changes in FLTK 1.4.5 Released: Apr 25 2026

This is a maintenance release with many improvements and fixes backported from the current development branch 'master' (1.5.0). This release is 100% backwards ABI and API compatible to release 1.4.0 and previous 1.4.x patch releases with default build options.

Major Bug Fixes

• Fix menu crash dereferencing nullptr (#1335)
• Fix crash in Fl_Tabs without children (#1366)
• Fix "Fl_Double_Window::make_current() issues with Cairo drawing" (#1285)
• Fix "Setting window custom cursor from SVG image crashes" (#1363)
• Fix "fl_draw_image() with horizontal flip reads out of bounds" (#1369)
• macOS: fix crash when drawing image with draw_image() in some scenarios (#1372)
• Wayland: avoid NULL-pointer error after call to wl_display_get_protocol_error()
• Wayland: Fix "Long Tooltips can crash ..." (#1317)
• Wayland: Fix NULL pointer dereference in Fl::cairo_make_current() (#1359)
• Wayland: Fix crash in test/sudoku if ALSA soundlib is not available
• Wayland: subwindows may grab scaling factor from wrong monitor (#1382)
• Windows: avoid crash when resizing window containing non-FLTK child window (#1401)
• X11: Fix crash with menubar across 2 screens with diverse scale factors (#1380)
• X11: Fl::enable_im() crashes without input methods (#1364)
• Fix "fl_add_symbol() always increments symbnumb" (#1410).
• Fix "Mac: Most fl_symbols missing corner pixels" (#1409).
• Fix "Mac: Stubborn tooltips when menu window is open" (#1408)

Minor Bug Fixes

• Applied xuyun018's fix for Fl_Tree horiz scroll (#1297)
• Fix: Underline does not appear in some fonts and scales (#1308)
• Fix "New Wayland subwindow code creates issues with resizes of opengl windows…" (#1311)
• Fix "Drawing to the wrong window with cairo and X11" (#1358)
• Fix "Cairo: Rect with negative dimensions is still drawn" (#1379)
• Fix "Blurry fonts with cairo/pango on FLTK >= 1.4" (#1365)
• Fix "Transparent PNGs not rendered correctly when window is scaled" (#1375)
• Close active menus when moving window to new screen
• macOS: Fix GL window child widgets when the window's screen changes resolution
• Wayland: don't call non-public libdecor_frame_get_content_{width,height} (#1296)
• Wayland: Some shortcut keys not delivered when input widget has focus (#1290)
• Wayland: fix creation of toplevel Fl_Gl_Window
• Wayland: fix minor paste and DnD issue revealed by valgrind
• Wayland: fix several issues related to scaling and to GL windows
• Wayland: Implement Fl_Window::xclass(const char*) for Wayland (#1391).
• Windows: Fix "If app appears on non-active screen …, window resizes" (#259)
• Windows: Fix "Window scaling shortcut always moves window towards initial display" (#1371)
• Wayland: call libdecor_dispatch(), libdecor_unref(), libdecor_get_fd() as expected by libdecor.
• X11: Restore use of menubar at top of fullscreen window
• X11/Wayland: Fix resize of menutitle windows when across 2 screens with diverse scaling

CMake And Other Build Procedure Improvements

• Bump version number from 1.4.4 to 1.4.5
• Don't export unnecessary executable files

Documentation Fixes and Improvements

• Fix documentation of fl_overlay_clear and fl_overlay_rect
• Clarify that a font must be loaded before measuring text (#1356)
• Improve docs related to "RGB sub image drawing slow with larger images" (#1384)

Other Improvements

• Remove usage of deprecated fl_utf8froma(), improve layout of test/utf8
• Remove conflicting FL_EXPORT from header file (#1357)
• Set window class name (xclass) in test/editor
• Fl_Terminal fixes from 1.5.x - smoother scrolling and issue #1328
• Fix Fl_Terminal drawing issues (WRT scrollbar and box clipping)
• Improve handling of text containing context-dependent unicode points
• Add complete support of emojis to text widgets (#1360)
• Fix issues with Fl_RGB_Image::draw() + window scaling, and performance concerns (#1370)
• Improve control of screen where FLTK positions menu windows (#1376)
• Improve Fl_Window::hotspot() when screens have different scale factors
• macOS: Remove slight transparency from menu windows (#1373)
• Wayland: use UTF-8 text from clipboard when available
• Wayland: improve function Fl_Wayland_Window_Driver::resize() (#1307)
• Windows: improve moving window across screens having distinct scale factors

ABI changes: only, if explicitly enabled by setting FL_ABI_VERSION >= 10405

• Make Fl_Table::get_selection() 'const' (ABI 10405) (#1305)