Update user guide

* Mention the new "Edit file" button and drag'n'drop of a script file
  to set the command.
* Updated screenshot.
* Optimized all PNGs.

Author: humdingerb

Assets/Screenshots/CommandSelectWindow.png

@@ -60,6 +60,9 @@ Command Management Window
 
 
 The command management window allows you to add/edit/remove/sort shortcuts.
+You can drag'n'drop a script to replace the currently shown command path.
+If the command is a script, the `Edit file` button will open it in a text editor.
+
 
 
 Command List

Assets/Screenshots/TrackRunnerCommands.png

@@ -23,6 +23,7 @@
 #include <Roster.h>
 #include <ScrollView.h>
 #include <StringView.h>
+#include <cstdio>
 #include <private/shared/ToolBar.h>
 
 
@@ -84,7 +85,7 @@ CommandsWindow::CommandsWindow(BString& title)
 						.SetInsets(0)
 						.Add(fBrowseButton = new BButton("Browse" B_UTF8_ELLIPSIS, new BMessage(kBrowseCommandAction)))
 						.AddGlue()
-						.Add(fEditButton = new BButton("Edit" B_UTF8_ELLIPSIS, new BMessage(kEditCommandAction)))
+						.Add(fEditButton = new BButton("Edit file" B_UTF8_ELLIPSIS, new BMessage(kEditCommandAction)))
 					.End()
 					.Add(fTerminalCheckBox, 1, 3)
 				.End()
@@ -184,17 +185,18 @@ CommandsWindow::_BrowseCommand()
 void
 CommandsWindow::_EditCommand()
 {
-	if (_CommandIsScript()) {
-		const char* argv[] = { fCommandControl->Text(), NULL };
-		be_roster->Launch("text/x-source-code", 1, argv);
-	}
+	BString file = _Deescape(fCommandControl->Text());
+	const char* argv[] = { file.String(), NULL };
+	printf("argv: %s\n\n", *argv);
+
+	be_roster->Launch("text/x-source-code", 1, argv);
 }
 
 
 bool
 CommandsWindow::_CommandIsScript()
 {
-	BPath path = fCommandControl->Text();
+	BPath path = _Deescape(fCommandControl->Text());
 	if (path.InitCheck() != B_OK)
 		return false;
 
@@ -207,6 +209,18 @@ CommandsWindow::_CommandIsScript()
 	return false;
 }
 
+
+const char*
+CommandsWindow::_Deescape(const char* path)
+{
+	BString text(path);
+	printf("original: %s\n", path);
+	text.CharacterDeescape('\\');
+	printf("deescaped: %s\n", text.String());
+	return text.String();
+}
+
+
 void
 CommandsWindow::_InitNewCommand()
 {

Assets/Screenshots/TrackRunnerIconMenu.png

@@ -35,6 +35,7 @@ class CommandsWindow : public BWindow {
 			void		_BrowseCommand();
 			void		_EditCommand();
 			bool		_CommandIsScript();
+			const char*	_Deescape(const char* path);
 			void		_RefsReceived(BMessage* message);
 			status_t	_LoadCommands();
 			status_t	_SaveCommands();