`glfwGetCocoaKeyEquivalent()` in `glfw/cocoa_window.m` expects the returned characters to be of type `unichar`, which won't work for all unicode characters because it is defined as `unsigned short` according to https://developer.apple.com/documentation/foundation/unichar?language=objc, which is only guaranteed to be at least 16 bits in size. The code calling this function also expects the encoding to be UTF-16.
When I added the various keys in https://github.com/kovidgoyal/kitty/pull/1928, I missed these facts. This means, that `glfwGetCocoaKeyEquivalent()` will behave unexpectedly when called with any of the new-ish keys. Luckily this function is currently only used for determining the macOS shortcut for `new_os_window` but I plan on using it more in the future.
Some of the constants, e.g. `NSBackspaceCharacter` are UTF-16 constants, so we can't just use UTF-8 everywhere.
I fixed the problem by using either UTF-8 characters packed into a `uint32_t` or UTF-16 characters in a `unichar` and then converting them to a UTF-8 encoded char string.
`NSEventModifierFlagNumericPad` isn't guaranteed to fit in a `unichar`, which made this undefined behaviour. It also didn't work. I tried to make it work using `NSEventModifierFlagNumericPad` as a modifier instead, as can be seen in this commit, but couldn't get it to work either because the constants used are native key codes and not unicode characters. Therefore the numpad keys will be removed in the next commit.
The time is stored in a signed 64 bit integer with nanosecond accuracy. This eliminates the possibility of floating-point inaccuracies.
`monotonic_t` can currently hold values large enough to work correctly for more than 200 years into the future.
Using a typedef instead of directly using `int64_t` everywhere will also allow easily changing the datatype in the future should the need arise for more precise or bigger time values.
See https://stackoverflow.com/questions/720052/nslog-incorrect-encoding.
The `%s` format placeholder for `NSLog()` expects an encoding other than UTF-8, which leads to garbled Unicode characters when trying to print a UTF-8 encoded string.
```Objective-C
NSLog(@"Ä %s %@", "Ä", @("Ä"));
```
prints `Ä √Ñ Ä`.
As can be seen in the example above, the workaround is to convert the UTF-8 encoded C-string to an `NSString` object and print that instead.
`debug_key()` calls `NSLog()`.
Also reduce input latency by ignoring repaint_delay when
there is actual pending input.
Gets rid of request_tick_callback(). Now empty events
result in the tick callback being called so there is only a
single mechanism for waking up the main loop and getting
the tick callback called.
I had added an optimization to not pass messages to
main thread every time the CVDisplayLink timer fired, unless
a render frame for that monitor was actually requested.
However, this optimization is impossible to implement wihtout a deadlock
since CVDisplayLink has its own internal lock that it does not expose.
So I guess macOS users with multiple monitors will simply have to take
the performance hit of useless wakeups sixty times a second for every
extra monitor.
Fixes#1779
