use just '#' instead of 'frame #2' in the threads/frame view

[llunak]

Summary

Since the threads/frame view is taking only a small part on the right side of the screen, only a part of the function name of each frame is visible. It seems rather wasteful to spell out 'frame' there when it's obvious that it is a frame, it's better to use the space for more of the function name.

lldb/source/Core/IOHandlerCursesGUI.cpp

public:
 
   bool TreeDelegateItemSelected(TreeItem &item) override { return false; }
 };
 
 class FrameTreeDelegate : public TreeDelegate {
 public:
   FrameTreeDelegate() : TreeDelegate() {
     FormatEntity::Parse(
-        "frame #${frame.index}: {${function.name}${function.pc-offset}}}",
-        m_format);
+        "#${frame.index}: {${function.name}${function.pc-offset}}}", m_format);
   }
 
   ~FrameTreeDelegate() override = default;
 
   void TreeDelegateDrawTreeItem(TreeItem &item, Window &window) override {
     Thread *thread = (Thread *)item.GetUserData();
     if (thread) {
       const uint64_t frame_idx = item.GetIdentifier();

lldb/test/API/commands/gui/expand-threads-tree/TestGuiExpandThreadsTree.py

def test_gui(self):
         escape_key = chr(27).encode()
 
         # Start the GUI and close the welcome window.
         self.child.sendline("gui")
         self.child.send(escape_key)
         self.child.expect_exact("Threads")
 
         # The thread running thread_start_routine should be expanded.
-        self.child.expect_exact("frame #0: break_here")
+        self.child.expect_exact("#0: break_here")
 
         # Exit GUI.
         self.child.send(escape_key)
         self.expect_prompt()
 
         # Select the main thread.
         self.child.sendline("thread select 1")
 
         # Start the GUI.
         self.child.sendline("gui")
         self.child.expect_exact("Threads")
 
         # The main thread should be expanded.
-        self.child.expect("frame #\d+: main")
+        self.child.expect("#\d+: main")
 
         # Quit the GUI
         self.child.send(escape_key)
 
         self.expect_prompt()
         self.quit()