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Replaces XSync with XFlush in drw_map to avoid unnecessary blocking round-trips to the X server during drawing operations. This improves the responsiveness of the window manager, especially during frequent updates like status bar redraws. Verified by compilation (with temporary environment adjustments) and code review.


PR created automatically by Jules for task 1232266377898493360 started by @paperbenni

Replaced the blocking `XSync(drw->dpy, False)` call with `XFlush(drw->dpy)` in `drw_map`.
`drw_map` is frequently called during UI redraws (e.g., status bar updates). `XSync` forces a round-trip to the X server, blocking the window manager until the server processes the request.
`XFlush` sends the request asynchronously, improving responsiveness and reducing latency in the main event loop.

Impact:
- Reduces blocking time during bar and window title redraws.
- Improves overall responsiveness of the window manager.
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