Fix:#780 Miguel/editor fix

[migsan1104]

This PR addresses issue #780 by implementing behavior consistent with modern editors:

If the user right-clicks inside an existing selection, the selection is preserved.

If the user right-clicks outside the selection, the caret moves to the clicked position and the context menu is invoked at the new location. The selection is also cleared.

Added build/ to .gitignore to avoid tracking generated files.

[migsan1104]

Thank you for letting me work on this project. :)

[dail8859]

Hi @migsan1104 apologies for the delay.

Although I think this is likely a valid solution, all the code within the scintilla directory is directly from a 3rd party library so I wouldn't want to maintain a separate copy or need to remember to edit it every time.

My first guess is that this section of code is the best place to handle it:

NotepadNext/src/NotepadNext/dialogs/MainWindow.cpp

Lines 1973 to 2010 in 6ab46c4

	connect(editor, &ScintillaNext::customContextMenuRequested, this, [=](const QPoint &pos) {
	contextMenuPos = editor->positionFromPoint(pos.x(), pos.y());
	QStringList actionNames = {
	"Cut",
	"Copy",
	"Paste",
	"Delete",
	"",
	"SelectAll",
	"",
	"Base64Encode",
	"URLEncode",
	"",
	"Base64Decode",
	"URLDecode"
	};
	// If the entry exists in the settings, use that
	ApplicationSettings *settings = app->getSettings();
	if (settings->contains("Gui/EditorContextMenu")) {
	actionNames = settings->value("Gui/EditorContextMenu").toStringList();
	}
	// If the cursor is at a URL, prepend the action
	URLFinder *urlFinder = editor->findChild<URLFinder *>(QString(), Qt::FindDirectChildrenOnly);
	if (urlFinder && urlFinder->isEnabled() && urlFinder->isURL(contextMenuPos)) {
	actionNames.prepend("");
	actionNames.prepend("CopyURL");
	}
	auto menu = buildMenu(actionNames);
	menu->addSeparator();
	menu->addMenu(ui->menuMarkAllOccurrences);
	menu->addMenu(ui->menuClearMarks);
	menu->popup(QCursor::pos());
	});

That is where the main window shows the context menu and may need to do some checking to see if its in a selection or not and possibly clear the selection.

Notepad++ also has this behavior and also uses Scintilla so it might have a recommended way of handling this case, but I havent taken the time to dig into the Notepad++ source code in quite a while.