extract: extract_one: make arguments const

extract.c

@@ -84,8 +84,8 @@ ensure_size(struct extraction_context *ctx, size_t additional_chars)
 }
 
 bool
-extract_one(struct terminal *term, struct row *row, struct cell *cell,
+extract_one(const struct terminal *term, const struct row *row,
-            int col, void *context)
+            const struct cell *cell, int col, void *context)
 {
     struct extraction_context *ctx = context;
 

extract.h

@@ -10,8 +10,8 @@ struct extraction_context;
 struct extraction_context *extract_begin(enum selection_kind kind);
 
 bool extract_one(
-    struct terminal *term, struct row *row, struct cell *cell, int col,
+    const struct terminal *term, const struct row *row, const struct cell *cell,
-    void *context);
+    int col, void *context);
 
 bool extract_finish(
     struct extraction_context *context, char **text, size_t *len);

terminal.h

@@ -542,3 +542,6 @@ void term_disable_app_sync_updates(struct terminal *term);
 
 enum term_surface term_surface_kind(
     const struct terminal *term, const struct wl_surface *surface);
+
+bool term_scrollback_to_text(const struct terminal *term, wchar_t **text);
+bool term_view_to_text(const struct terminal *term, wchar_t **text);