LibGUI: Allow overriding toolbar button tooltips

The EmojiInputDialog, for example, will want its toolbar buttons to have
a tooltip which differs from its text. If no tooltip override has been
provided, we fall back to the button text still.

Userland/Libraries/LibGUI/Action.cpp

@@ -296,4 +296,17 @@ void Action::set_text(DeprecatedString text)
     });
 }
 
+void Action::set_tooltip(DeprecatedString tooltip)
+{
+    if (m_tooltip == tooltip)
+        return;
+    m_tooltip = move(tooltip);
+    for_each_toolbar_button([&](auto& button) {
+        button.set_tooltip(*m_tooltip);
+    });
+    for_each_menu_item([&](auto& menu_item) {
+        menu_item.update_from_action({});
+    });
+}
+
 }

Userland/Libraries/LibGUI/Action.h

@@ -85,6 +85,9 @@ public:
     DeprecatedString text() const { return m_text; }
     void set_text(DeprecatedString);
 
+    DeprecatedString tooltip() const { return m_tooltip.value_or(m_text); }
+    void set_tooltip(DeprecatedString);
+
     DeprecatedString const& status_tip() const { return m_status_tip; }
     void set_status_tip(DeprecatedString status_tip) { m_status_tip = move(status_tip); }
 
@@ -144,6 +147,7 @@ private:
     void for_each_menu_item(Callback);
 
     DeprecatedString m_text;
+    Optional<DeprecatedString> m_tooltip;
     DeprecatedString m_status_tip;
     RefPtr<Gfx::Bitmap const> m_icon;
     Shortcut m_shortcut;

Userland/Libraries/LibGUI/Toolbar.cpp

@@ -71,7 +71,7 @@ private:
     DeprecatedString tooltip(Action const& action) const
     {
         StringBuilder builder;
-        builder.append(action.text());
+        builder.append(action.tooltip());
         if (action.shortcut().is_valid()) {
             builder.append(" ("sv);
             builder.append(action.shortcut().to_deprecated_string());