LibLine: Check the terminal size at the start of get_line()

There are cases where the line editor could miss the WINCH signal
(e.g. in the shell, while another program is in the foreground),
This patch makes it so that LibLine notices the change in terminal size
in such cases.

1 files changed, 10 insertions, 2 deletions

diff --git a/Userland/Libraries/LibLine/Editor.cpp b/Userland/Libraries/LibLine/Editor.cpp
index e86d08bff0..d66cfde642 100644
--- a/Userland/Libraries/LibLine/Editor.cpp
+++ b/Userland/Libraries/LibLine/Editor.cpp
@@ -208,6 +208,7 @@ Editor::~Editor()
 void Editor::get_terminal_size()
 {
     struct winsize ws;
+
     if (ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) < 0) {
         m_num_columns = 80;
         m_num_lines = 25;
@@ -502,8 +503,8 @@ void Editor::initialize()
     struct termios termios;
     tcgetattr(0, &termios);
     m_default_termios = termios; // grab a copy to restore
-    if (m_was_resized)
-        get_terminal_size();
+
+    get_terminal_size();
 
     if (m_configuration.operation_mode == Configuration::Unset) {
         auto istty = isatty(STDIN_FILENO) && isatty(STDERR_FILENO);
@@ -629,6 +630,13 @@ auto Editor::get_line(const String& prompt) -> Result<String, Editor::Error>
         return Error::ReadFailure;
     }
 
+    auto old_cols = m_num_columns;
+    auto old_lines = m_num_lines;
+    get_terminal_size();
+
+    if (m_num_columns != old_cols || m_num_lines != old_lines)
+        m_refresh_needed = true;
+
     set_prompt(prompt);
     reset();
     strip_styles(true);