This implements simple window shadows around most windows, including
tooltips. Because this method uses a bitmap for the shadow bits,
it is limited to rectangular window frames. For non-rectangular
window frames we'll need to implement a more sophisticated algorithm.
This commit:
- merges the two(!) places that defined independently the minimum size of a window.
- splits Window::normalize_rect(), which was originally just a function to apply
the minimum size requirement, and has taken on the additional job of nudging
windows back onto the desktop.
This inadvertantly fixes a crash that happens when a malicious program creates a
window of size (0, 0). Now, a window at [0,0 50x50] is created instead.
- Unmaximization/untiling had nearly but not quite code duplication;
this patch replaces the actual "regrabbing" logic with Rect::set_size_around.
- When undoing maximization/untiling, it used to be possible to to grab a window
"outside" of its frame, and thus drag it off the screen. This is no longer
possible. Fixes#4644.
- As a side effect, when untiling from the bottom/left/right, the regrab is now
a much smoother experience.
- Setting the resize aspect ratio while being tiled now untiles and umaximizes
the window, as these things are incompatible. Fixes an undocumented bug
(steps to reproduce: maximize, then set aspect ratio).
- When unmaximizing, spurious WindowLeft events were sent, because that path
didn't set hovered_window. Fixes an undocumented bug.
Since these things are interwoven, this is all a single commit.
Previously, SetWindowRect and SetWindowRect could supply basically arbitrary
x and y coordinates. This could happen either due to a malicious or malfunctioning
program, or even due to the auto-centering feature.
This patch also moves the 'normalization' code out of ClientConnection to Window,
where it belongs better.
Fixes#4135.
Fixes#5052.
