This aligns the Windows platform implementation with a code style
similar to macOS platform, eliminating most of the `Cell`s and
`Mutex`es. This adjustment facilitates potential future porting to a
multi-threaded implementation if required.
Overall, this PR made the following changes: it segregated all member
variables in `WindowsPlatform` and `WindowsWindow`, grouping together
variables that remain constant throughout the entire app lifecycle,
while placing variables that may change during app runtime into
`RefCell`.
Edit:
During the code refactoring process, a bug was also fixed.
**Before**:
Close window when file has changed, nothing happen:
https://github.com/zed-industries/zed/assets/14981363/0bcda7c1-808c-4b36-8953-a3a3365a314e
**After**:
Now `should_close` callback is properly handled
https://github.com/zed-industries/zed/assets/14981363/c8887b72-9a0b-42ad-b9ab-7d0775d843f5
Release Notes:
- N/A
A subsequent update introduced the `HMONITOR` value to the
`WindowsDisplay` struct, eliminating the need for polling to retrieve
this value.
Release Notes:
- N/A
Sharing a project displays a notification (window) on every screen.
Previously there was an issue with the positioning of windows on all
screens except the primary screen.
As you can see here:

Now:

@mikayla-maki and I also decided to refactor the `WindowOptions` a bit.
Previously you could specify bounds which controlled the positioning and
size of the window in the global coordinate space, while also providing
a display id (which screen to show the window on). This can lead to
unusual behavior because you could theoretically specify a global bound
which does not even belong to the display id which was provided.
Therefore we changed the api to this:
```rust
struct WindowOptions {
/// The bounds of the window in screen coordinates
/// None -> inherit, Some(bounds) -> set bounds.
pub bounds: Option<Bounds<DevicePixels>>,
/// The display to create the window on, if this is None,
/// the window will be created on the main display
pub display_id: Option<DisplayId>,
}
```
This lets you specify a display id, which maps to the screen where the
window should be created and bounds relative to the upper left of the
screen.
Release Notes:
- Fixed positioning of popup windows (e.g. when sharing a project) when
using multiple external displays.
---------
Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>
This reverts #9053 and #9375 because they introduced a regression on
`main` that broke the titlebars on macOS:

Two things are off:
- Left padding is missing
- Titlebar height is less than it was before, which means the
traffic-light buttons are not centered vertically
What @as-cii and I noticed while looking into this: the `cfg!(macos)`
macros that were used don't work like that. You need to check for
`cfg!(target = "macos")` etc. Means that on macOS we never used the
macOS-specific code because the condition was always false.
Overall height, we're not sure about.
Release Notes:
- N/A
Tested on my laptop, and I've noticed that when I move the window,
`WindowsPlatform::displays()` is being continuously called. Is this
intended?
Release Notes:
- N/A
For the moment the windows port has a single display with hard-coded
values.
This first PR is just to at least fetch the **actual size of the current
display**. The idea
is using this code as a first template to start getting familar with the
code base
and prepare the work for enumerating all displays.