Add per-window resize-margin override (Hyprland's extend_border_grab_area)

MISSING.md had listed this as needing to touch srdwm_core::window::
hit_test's signature at every call site, including the honest-stub
Windows/macOS backends - overstated on closer inspection: that shared
function already takes a plain resize_margin: i32 parameter, agnostic
to where the value comes from. The only real change needed was reading
Window.resize_margin.unwrap_or(wm-wide default) instead of always the
WM-wide value, at the single call site inside WindowManager::hit_test
in core - no backend touched at all.

Window.resize_margin: Option<i32>, WindowRuleActions.resize_margin to
match, applied in add_window/reapply_rules_if_pending the same way
opacity already is. Settable via a rule action or
srd.window.set_resize_margin(n) on the focused window.

1 files changed, 1 insertions, 0 deletions

diff --git a/crates/config/src/engine/register.rs b/crates/config/src/engine/register.rs
index d68d253..abe919b 100644
--- a/crates/config/src/engine/register.rs
+++ b/crates/config/src/engine/register.rs
@@ -45,6 +45,7 @@ impl Engine {
         window.set("set_border_color", self.fn_window_set_border_color()?)?;
         window.set("set_border_width", self.fn_window_set_border_width()?)?;
         window.set("set_opacity", self.fn_window_set_opacity()?)?;
+        window.set("set_resize_margin", self.fn_window_set_resize_margin()?)?;
         window.set("set_floating", self.fn_window_set_floating()?)?;
         window.set("toggle_floating", self.fn_window_action(WindowAction::ToggleFloating)?)?;
         window.set("is_floating", self.fn_window_is_floating()?)?;