info component style config use ui.info ui.info.text (#643)

helix-term/src/ui/info.rs

@@ -6,8 +6,12 @@ use tui::widgets::{Block, Borders, Paragraph, Widget};
 
 impl Component for Info {
     fn render(&mut self, viewport: Rect, surface: &mut Surface, cx: &mut Context) {
-        let text_style = cx.editor.theme.get("ui.text.focus");
-        let popup_style = text_style.patch(cx.editor.theme.get("ui.popup"));
+        let get_theme = |style, fallback| {
+            let theme = &cx.editor.theme;
+            theme.try_get(style).unwrap_or_else(|| theme.get(fallback))
+        };
+        let text_style = get_theme("ui.info.text", "ui.text");
+        let popup_style = text_style.patch(get_theme("ui.info", "ui.popup"));
 
         // Calculate the area of the terminal to modify. Because we want to
         // render at the bottom right, we use the viewport's width and height