Use custom titles for register select info boxes

Previously all register selection info boxes had "Registers" as the
title. That was particularly confusing for `copy_between_registers`
which presents two info boxes back-to-back.

helix-term/src/commands.rs

@@ -5544,7 +5544,10 @@ fn wonly(cx: &mut Context) {
 }
 
 fn select_register(cx: &mut Context) {
-    cx.editor.autoinfo = Some(Info::from_registers(&cx.editor.registers));
+    cx.editor.autoinfo = Some(Info::from_registers(
+        "Select register",
+        &cx.editor.registers,
+    ));
     cx.on_next_key(move |cx, event| {
         cx.editor.autoinfo = None;
         if let Some(ch) = event.char() {
@@ -5554,7 +5557,10 @@ fn select_register(cx: &mut Context) {
 }
 
 fn insert_register(cx: &mut Context) {
-    cx.editor.autoinfo = Some(Info::from_registers(&cx.editor.registers));
+    cx.editor.autoinfo = Some(Info::from_registers(
+        "Insert register",
+        &cx.editor.registers,
+    ));
     cx.on_next_key(move |cx, event| {
         cx.editor.autoinfo = None;
         if let Some(ch) = event.char() {
@@ -5571,7 +5577,10 @@ fn insert_register(cx: &mut Context) {
 }
 
 fn copy_between_registers(cx: &mut Context) {
-    cx.editor.autoinfo = Some(Info::from_registers(&cx.editor.registers));
+    cx.editor.autoinfo = Some(Info::from_registers(
+        "Copy from register",
+        &cx.editor.registers,
+    ));
     cx.on_next_key(move |cx, event| {
         cx.editor.autoinfo = None;
 
@@ -5585,7 +5594,10 @@ fn copy_between_registers(cx: &mut Context) {
         };
         let values: Vec<_> = values.map(|value| value.to_string()).collect();
 
-        cx.editor.autoinfo = Some(Info::from_registers(&cx.editor.registers));
+        cx.editor.autoinfo = Some(Info::from_registers(
+            "Copy into register",
+            &cx.editor.registers,
+        ));
         cx.on_next_key(move |cx, event| {
             cx.editor.autoinfo = None;
 

helix-view/src/info.rs

@@ -57,13 +57,13 @@ impl Info {
         }
     }
 
-    pub fn from_registers(registers: &Registers) -> Self {
+    pub fn from_registers(title: impl Into<Cow<'static, str>>, registers: &Registers) -> Self {
         let body: Vec<_> = registers
             .iter_preview()
             .map(|(ch, preview)| (ch.to_string(), preview))
             .collect();
 
-        let mut infobox = Self::new("Registers", &body);
+        let mut infobox = Self::new(title, &body);
         infobox.width = 30; // copied content could be very long
         infobox
     }