Screenshot Notification: cleaned up and tweaked a few things

* Added textdomain closure missing from 267510ea076ce317d323da54bb81ccd255b93284
* Avoid use of invalidate_layout by having an em dash in the size field prior to
  saving. That's needed since GUI2 doesn't expand the label's canvas if its text
  is initially empty.
* Use a better button definition for the View button.
* Grouped Save and Close buttons together

data/gui/window/screenshot_notification.cfg

@@ -45,7 +45,7 @@
 
 				[button]
 					id = "open"
-					definition = "action_browse"
+					definition = "action_go"
 					label = _ "filesystem^Open"
 					tooltip = _ "Open this file with an external application"
 				[/button]
@@ -81,8 +81,6 @@
 				grow_factor = 0
 
 				[column]
-					#textdomain wesnoth
-
 					grow_factor = 1
 
 					border = "all"
@@ -93,7 +91,9 @@
 						id = "title"
 						definition = "title"
 
+						#textdomain wesnoth
 						label = _ "Screenshot"
+						#textdomain wesnoth-lib
 					[/label]
 
 				[/column]
@@ -146,12 +146,11 @@
 							[column]
 								border = "all"
 								border_size = 5
-								horizontal_alignment = "left"
+								horizontal_grow = true
 
 								[label]
-									label = ""
 									id = "filesize"
-									wrap = true
+									definition = "default"
 								[/label]
 
 							[/column]
@@ -176,6 +175,7 @@
 							grow_factor = 0
 
 							[column]
+								grow_factor = 1
 								border = "all"
 								border_size = 5
 								horizontal_alignment = "left"

src/gui/dialogs/screenshot_notification.cpp

@@ -90,6 +90,8 @@ void screenshot_notification::pre_show(window& window)
 	connect_signal_pre_key_press(path_box, std::bind(&screenshot_notification::keypress_callback, this,
 		std::placeholders::_3, std::placeholders::_5));
 
+	find_widget<label>(&window, "filesize", false).set_label(font::unicode_em_dash);
+
 	button& copy_b = find_widget<button>(&window, "copy", false);
 	connect_signal_mouse_left_click(
 		copy_b, std::bind(&desktop::clipboard::copy_to_clipboard, std::ref(path_), false));
@@ -139,8 +141,6 @@ void screenshot_notification::save_screenshot()
 		const int filesize = filesystem::file_size(path.string());
 		const std::string sizetext = utils::si_string(filesize, true, _("unit_byte^B"));
 		find_widget<label>(&window, "filesize", false).set_label(sizetext);
-
-		window.invalidate_layout();
 	}
 }