fix: contract the deps correctly

Author: aignas

python/pip_install/tools/wheel_installer/wheel.py

@@ -172,6 +172,22 @@ def add(self, dep: str, platform: Platform | None = None):
             for p, deps in self.select.items():
                 self.select[p] = deps - {dep}
 
+    def build(self, all_platforms: list[Platform]) -> Deps:
+        # Move deps to common deps if they are present for all platforms
+        common_deps = None
+        for plat in all_platforms:
+            deps = self.select.get(plat, set())
+            common_deps = deps if common_deps is None else common_deps & deps
+
+        if common_deps:
+            for d in common_deps:
+                self.add(d)
+
+        return Deps(
+            deps=self.deps,
+            select={p: deps for p, deps in self.select.items() if deps},
+        )
+
 
 class Wheel:
     """Representation of the compressed .whl file"""
@@ -275,16 +291,7 @@ def dependencies(
                         # TODO @aignas 2023-12-04: allow to resolve for extras separately
                         break
 
-        # Move deps to common deps if they are present for all platforms
-        common_deps = None
-        for plat, deps in dependency_set.select.items():
-            common_deps = deps if common_deps is None else common_deps & deps
-
-        if common_deps:
-            for d in common_deps:
-                dependency_set.add(d)
-
-        return dependency_set
+        return dependency_set.build(plat_markers.keys())
 
     def unzip(self, directory: str) -> None:
         installation_schemes = {