Returning HTTRANSPARENT from WM_NCHITTEST does cause the window to be
transparent for some hit-testing APIs but does not make it pass mouse
input through to whatever window is below it.
For that to work on modern Windows, the window needs to be both layered
and extended-window-style-transparent.
Additional logic changes to ensure mouse input passthrough, framebuffer
transparency and window opacity are mindful of one another when
modifying WS_EX_LAYERED.
Related to #1568.
The client clip region was left in place when mouse passthrough was
disabled, leading to missing mouse input if the window grew beyond it.
Related to #1568.
This adds the GLFW_MOUSE_PASSTHROUGH window hint and attribute for
controlling whether mouse input passes through the window to whatever
window is behind it.
Fixes#1236.
Closes#1568.
It seems it has not been possible to compile GLFW on systems without the
UTF-8 extensions to Xlib since a0a5cc57df
was merged five months ago. The UTF-8 extension functions were
introduced with XFree86 4.0.2 in December 2000 and are likely widely
available at this point.
This removes the locale-dependent fallback paths and uses the UTF-8
extension functions where available.
Background: The IM will filter out key events, instead sending exact
duplicate events that are not filtered. It does not send these for
every event, however, so the duplicate events cannot be relied on for
key input. Instead we need to identify and discard them. Since they
are identical, they have the same timestamp as the originals.
The previous duplicate event detection would consume unrelated key
events if the keys were pressed simultaneously, as it only tracked
a single timestamp.
This fixes that issue for any combination of keys, at the expense of
a 1 KB array per GLFW window.
This fix is a stopgap until explicit IME support is done.
Based on #1472 by @LucaRood.
Fixes#1112.
Fixes#1415.
Fixes#1616.
Fixes#1663.
Closes#1472.
The documentation for window hints had several features that had not
been carried over to init hints.
This also removes listing glfwInitHint for each hint, which was an
artifact of the removal of glfwInitHintString.
