Fix to let the wheel follow the selected editor

Makefile

@@ -104,6 +104,7 @@ LIBS += git2
 LIBS += src/scintilla/bin/libscintilla.a
 LIBS += yaml-cpp
 LIBS += editorconfig
+LIBS += game
 
 SYSTEM_INCLUDE_PATHS  = $(shell findpaths -e B_FIND_PATH_HEADERS_DIRECTORY private/interface)
 SYSTEM_INCLUDE_PATHS += $(shell findpaths -e B_FIND_PATH_HEADERS_DIRECTORY private/shared)

src/helpers/Utils.cpp

@@ -21,6 +21,7 @@
 #include <Resources.h>
 #include <Roster.h>
 #include <SystemCatalog.h>
+#include <WindowScreen.h>
 
 #include <algorithm>
 #include <string>
@@ -34,6 +35,24 @@ using BPrivate::gSystemCatalog;
 #define B_TRANSLATION_CONTEXT "Utilities"
 
 
+void
+FakeMouseMovement(BView* view)
+{
+	// This is mostly due to a limition of the app_server:
+	// the wheel mouse message is always target to the view with the last mouse movement.
+	// in case a view appear under the mouse without any movement (ALT+TAB on a .cpp to open the .h)
+	// the wheel is moving the wrong scrollbars (no matter of the focus).
+	// the workaround is to fake a mouse movement to update the view under the cursor when an
+	// Editor is selected.
+	//
+	BPoint location;
+	uint32 buttons = 0;
+	view->GetMouse(&location, &buttons);
+	view->ConvertToScreen(&location);
+	set_mouse_position(location.x, location.y);
+}
+
+
 std::string
 GetFileName(const std::string filename)
 {
@@ -64,8 +83,8 @@ GetVectorIcon(const std::string icon, BBitmap* bitmap)
 
 	BResources* resources = BApplication::AppResources();
 	size_t size;
-	const uint8* rawIcon;
-	rawIcon = (const uint8*)resources->LoadResource(B_VECTOR_ICON_TYPE, icon.c_str(), &size);
+	const uint8* rawIcon = reinterpret_cast<const uint8*>(
+		resources->LoadResource(B_VECTOR_ICON_TYPE, icon.c_str(), &size));
 	if (rawIcon == nullptr)
 		return B_ERROR;
 
@@ -206,7 +225,8 @@ KeyDownMessageFilter::Filter(BMessage* message, BHandler** target)
 
 template<>
 entry_ref
-find_value<B_REF_TYPE>(BMessage* message, std::string name, int index) {
+find_value<B_REF_TYPE>(BMessage* message, std::string name, int index)
+{
 	entry_ref ref;
 	status_t status = message->FindRef(name.c_str(), index, &ref);
 	if(status == B_OK) {

src/helpers/Utils.h

@@ -24,6 +24,7 @@ class BRadioButton;
 
 struct entry_ref;
 
+void	FakeMouseMovement(BView* view);
 
 std::string GetFileName(const std::string filename);
 std::string GetFileExtension(const std::string filename);

src/ui/GenioWindow.cpp

@@ -1137,6 +1137,7 @@ GenioWindow::MessageReceived(BMessage* message)
 				}
 
 				editor->GrabFocus();
+				FakeMouseMovement(editor);
 				_UpdateTabChange(editor, "TABMANAGER_TAB_SELECTED");
 
 				BMessage tabSelectedNotice(MSG_NOTIFY_EDITOR_FILE_SELECTED);